2021 Ford Mustang Convertible

Convertible mirrors the coupe on the two available engines: GT 5.0L Ti-VCT Coyote V8 rated 460 hp is the volume trim; EcoBoost 2.3L turbo four makes 310 hp base or 330 hp with the High Performance Package. The new-for-2021 Mach 1 (480 hp) and Shelby GT500 (760 hp) are fastback-only, so the drop-top loses the top two power tiers.

GT V8 delivers 420 lb-ft on the volume trim; EcoBoost 2.3T makes 350 lb-ft on a broad plateau in both base and HPP tunes — same engines as the coupe.

The convertible carries ~150 lb of chassis reinforcement over the fastback, pushing 0–60 times roughly 0.2 s slower across the board. Coupe GT 10AT with Performance Package clocks ~4.3 s in instrumented tests, so the drop-top GT lands in the mid-4-second range; EcoBoost convertible ~5.4 s.

Same Gen 3 Coyote 5.0 V8 and 2.3T EcoBoost as the coupe — nothing changes mechanically top-down. The V8 remains smooth, torquey, and free-revving with immediate throttle response; the EcoBoost pulls hard with early torque but reviewers note occasional coarseness under load. Open cabin amplifies the V8's aural refinement while making EcoBoost turbo hiss more evident.

Ford's 10R80 10-speed automatic is widely praised — quick, decisive shifts that keep the V8 in its powerband and no hunting in daily driving. The Getrag MT-82 6-speed manual (still standard on GT and EcoBoost) comes with rev-matching on GT, one of the last affordable V8 manual convertibles on the market. Some 10AT calibration friction with EcoBoost noted in reviews.

Every 2021 Mustang Convertible trim (EcoBoost Premium, GT Premium) is rear-wheel drive only — Ford does not offer AWD anywhere in the Mustang lineup, unlike some AWD droptop rivals (BMW M4 Competition xDrive Convertible, Audi RS 5 Cabriolet). Scores at the low end of the guidance for RWD-only.

Only two engine families are offered on the 2021 convertible — 2.3T EcoBoost I4 (310 hp base, 330 hp with HPP) and 5.0 V8 GT (460 hp). The new-for-2021 Mach 1 5.0 V8 (480 hp) and Shelby GT500 5.2 supercharged Predator V8 (760 hp) are coupe-exclusive, so the drop-top loses the top two tiers of the range. Zero electrification (no hybrid, PHEV, or EV variant), which caps this in the mid-band per the 'includes electrified options' criterion.

The 2021 Mustang Convertible EcoBoost 2.3T with the 10-speed auto is EPA-rated 23 MPG combined — the volume topless trim, still on the pre-refresh S550 platform. GT V8 convertibles drop to 18 MPG combined. Ratings sit well below hybrid-driven convertible rivals.

EcoBoost auto returns 20 MPG city — the floor of the convertible city band. GT V8 convertibles sit at 15 city, well below segment norms dominated by hybrid-driven small cars.

EcoBoost highway MPG (28) is the convertible's efficiency high-water mark — modest for a topless performance car and far behind hybrid rivals that clear 50 MPG. GT V8 trims deliver only 23–24 highway.

15.5-gallon fuel tank × EPA 23 MPG combined puts the EcoBoost convertible's total range near 356 miles per fueleconomy.gov — middling for the convertible band. GT V8 auto falls to roughly 279 miles between fill-ups.

fueleconomy.gov posts $2,600/yr for the volume EcoBoost 2.3T convertible on regular gasoline at 15,000 mi/yr. GT V8 auto climbs to $3,350/yr on the same regular-gas assumption. The convertible model average lands in the upper-cost half of the segment band.

EPA classifies every 2021 Mustang Convertible variant — EcoBoost 2.3T, EcoBoost HO, and GT 5.0 V8 — as running on Regular Gasoline (87 octane), a key advantage over the S650 refresh which moved the 2.3T to premium. Ford recommends 91 octane on the GT V8 for peak advertised power, but 87 is fully supported. No E85, no diesel, no electrified option; landing at the top of the 'runs on regular' band.

NHTSA did not comprehensively rate the 2021 Ford Mustang Convertible — as is common for low-volume convertibles. The 2021 Mustang 2-door coupe on the S550 platform received 4 stars overall (frontal 4, side 5, rollover 4). Convertibles typically score no better than their coupe siblings given the compromised structural upper body, so 4 stars is a defensible estimate.

IIHS does not run its full crashworthiness battery on convertibles (no roof-strength test, limited side-impact protocol), so the 2021 Mustang Convertible cannot earn Top Safety Pick. Structural performance is expected to broadly track the S550 coupe's mixed results — Good moderate-overlap front, Good side, but Marginal passenger-side small-overlap and Marginal/Acceptable headlight ratings. Sits at the top of the lower band.

For 2021, the Mustang's Ford Co-Pilot360 content (Pre-Collision Assist with AEB, BLIS with Cross-Traffic Alert, Lane-Keeping System, Auto High-Beams) is bundled in the optional Safe & Smart Package on the volume EcoBoost/GT Premium trims rather than being fully standard as it later became on the S650. Standard content is limited to the rear-view camera, AdvanceTrac ESC, and TPMS. Sits in the middle band because core AEB and BSM are available across the range but customers can and do skip the package.

Ford's Pre-Collision Assist with Pedestrian Detection on the 2021 Mustang was not individually IIHS-rated for front crash prevention, but the same generation of the system in Ford platform mates earned Superior daytime vehicle-to-vehicle and Basic-to-Advanced night pedestrian ratings. Adequate daytime, weaker night/pedestrian — middle band.

BLIS with Cross-Traffic Alert is bundled in the optional Safe & Smart Package on 2021 Mustang Convertibles — available but not standard. Alert-only intervention (no active steering) and no trailer coverage. The system is especially valuable on the convertible because the folded fabric roof creates a large rear-quarter blind zone with the top up, but the optional status keeps this in the middle band.

The 2021 Mustang's Lane-Keeping System (part of the optional Safe & Smart Package) is limited to lane-departure warning plus a corrective steering nudge — Ford does not offer true lane centering on the S550 Mustang. Reviewers describe the nudge as usable but reactive, well behind competitors with full lane-centering assist. Optional status further limits real-world adoption.

Adaptive Cruise Control with Stop-and-Go is available on 2021 Mustang Convertibles via the Safe & Smart Package but only with the 10-speed automatic — manual-transmission cars get no ACC. When equipped, reviewers describe it as competent but not combined with lane centering into a mature highway-assist mode.

Ford's BlueCruise hands-free highway system did not exist for the 2021 model year — BlueCruise launched on the 2021 F-150 and Mustang Mach-E with an over-the-air update in mid-2022. It has never been offered on any gas Mustang, coupe or convertible. Bottom of the guidance band.

Full LED headlamps are standard on all 2021 Mustang Convertibles (introduced in the 2018 refresh); auto high-beams require the optional Safe & Smart Package. The S550 Mustang earned Marginal to Acceptable IIHS headlight ratings depending on trim during the 2019–2022 test window, keeping this in the middle band.

Top-down visibility is excellent, but with the fabric roof raised the over-the-shoulder and rear three-quarter views are severely blocked — worse than the coupe because of the folded-top stack behind the rear seats and a small heated-glass rear window. A standard rear-view camera helps in parking; 360-degree camera not offered on the 2021 Mustang. Below-average even against convertible peers.

The Mustang Convertible is a 4-seater on paper but the rear seat is largely a token space. LATCH access requires tumbling a front seat forward and ducking through a single narrow doorway; the folded top mechanism intrudes on rear-facing seat vertical clearance and headroom. Firmly in the difficult-anchors, tight-quarters band.

Standard 2+2 layout across the 2021 EcoBoost, EcoBoost Premium, GT, and GT Premium Convertible trims; front buckets plus a token rear bench that also stiffens the drop-top chassis. Mach 1 and Shelby GT500 are coupe-only.

The S550 Convertible carries the same 37.6 in front headroom Ford publishes across the sixth-generation run — mid-band for the convertible segment.

Class-leading front legroom carried across the S550 generation — a generous driver's cell that easily accommodates tall occupants top-up or top-down.

With the soft top raised, rear headroom falls below the convertible band's 35 in floor — the folded top mechanism sits directly behind the rear bench, giving passengers less clearance than in the S650 successor.

Rear legroom sits below the convertible band's 32 in floor — a token space for children or short adults on brief trips only. Slightly better than the S650 successor's 29.0 in figure but still bottom-of-segment.

The soft-top mechanism trims trunk volume versus the fastback's 13.5 cu ft — enough for a couple of soft weekender bags or a golf bag but not much more. Volume is unchanged whether the top is raised or lowered.

Modest sports-coupe storage carried over from the fastback: small center console bin, shallow door pockets, tight glovebox. The soft-top mechanism eats what would be a rear trunk pass-through in the fastback and there is no fold-flat rear seat. No onboard power outlets or clever solutions — sparser than the S650 refresh and behind soft-top rivals like the BMW 4 Series Convertible.

Front buckets shared with the coupe are comfortable for long stints but cushions run flat and lateral bolstering is modest; Recaros are coupe-only (Mach 1, Shelby GT500) and not offered on 2021 Convertible trims. The rear bench is unusable for anyone over 5'6" — cushion is short and the top mechanism sits close overhead.

The S550 Convertible keeps the fastback's grand-tourer softness on smooth pavement but chopping the roof introduces clear cowl shake over broken pavement — a well-documented flaw versus rigid unibody rivals. Optional MagneRide (GT Performance Package) helps but does not fully mask the reduced structural rigidity. Firmer and less composed than the S650 successor.

Fabric top admits substantial wind and road noise at highway speed even with the roof up — clearly noisier than premium soft-tops (BMW 4 Series Convertible, Mercedes CLE) and behind the fastback. GT's active exhaust broadcasts intake and exhaust note; top-down cruising is obviously loud. Bottom half of the segment.

Dual-zone automatic climate, push-button start, and keyless entry are standard across the 2021 Convertible range; heated + ventilated front seats and a heated steering wheel come with the Premium equipment groups (EcoBoost Premium and GT Premium Convertible). No neck-warmer or top-down-specific comfort features, and no rear climate given the vestigial back seat. Slightly less standard-content than the current S650 but broadly the same equipment ladder.

The 2021 Mustang EcoBoost Convertible opened at $32,155 base plus ~$1,195 destination — roughly $6k under the fastback EcoBoost premium for the soft-top hardware. Sits in the affordable half of the convertible normalization band, well below premium drop-top rivals like the BMW 4 Series Convertible ($55k+).

EcoBoost Premium Convertible is the volume drop-top trim, opening near $37,895 with destination and reaching ~$39k with common option packs (SYNC 3 9-speaker upgrade, painted aluminum wheels, safe-and-smart package). GT Premium Convertible tops the ladder near $47.5k but the EcoBoost Premium is the higher-volume config.

Convertible-body Mustangs run modestly higher 5-year maintenance projections than the coupe due to soft-top mechanism upkeep on top of standard sports-car brake and tire wear. RepairPal/CarEdge Mustang class data puts the 2021 drop-top a couple hundred dollars above the ~$5,600 fastback figure.

The 2021 Mustang has now been on the road ~5 years, so retention can be measured against current KBB/iSeeCars used values rather than projected. Convertibles depreciate a couple points faster than the fastback, but strong Mustang nameplate demand keeps the 2021 Convertible near ~50-52% MSRP retention — better than most sports-car soft-tops.

Ford's 2021 new-vehicle limited warranty is 3 years / 36,000 miles — industry baseline and the floor of the convertible normalization band. Now expired as of 2024 for original buyers. Unchanged Ford policy through 2026.

Ford 2021 powertrain coverage is 5 years / 60,000 miles — the industry floor, well behind Hyundai/Kia's 10-year plans and at the low end of the convertible normalization band. Coverage expired in 2026 for original buyers hitting mileage caps first. Unchanged Ford policy through 2026.

No complimentary scheduled maintenance program (unlike BMW/Jaguar included plans of the era). Ford did include 5-year/60,000-mile roadside assistance — above the industry norm — plus a short FordPass Connect connected-services trial and FordPass Rewards points at purchase (~3 oil changes' worth). Absent free scheduled service caps the score.

$38,000 volume-trim price minus its estimated resale value after 5 years (51% retained, or about $19,380) leaves about $18,620 in depreciation. Add the projected $5,900 in 5-year maintenance and repairs, and owning this vehicle for 5 years costs about $24,520 in total.

The 2021 Mustang sits late in the S550 generation's mature phase, and Consumer Reports/J.D. Power have logged mostly average-to-above-average reliability for this vintage; the convertible variant carries a modest deduction for the folding-top mechanism and cowl-shake-related complaints.

Ford has been a consistently mid-to-lower-pack brand in Consumer Reports reliability and J.D. Power VDS rankings for years — competent but not a dependability leader like Toyota/Lexus or Porsche.

The 2021 Mustang has accumulated a modest handful of NHTSA recalls over the past five years (rearview-camera image, windshield-trim retention, some transmission-related items) — typical activity for the segment with nothing catastrophic; most fixes have been dispatched by now.

The 2021 Mustang runs the third-generation 5.0L Coyote V8 (2018-2023) and the 2.3L EcoBoost I4 — both are mature, high-mileage-proven units by 2021 with large owner data pools showing few systemic failures; the 10-speed auto's early-year growing pains were largely sorted by 2021.

The S550 cabin — even after the 2018 refresh — was widely criticized by reviewers as hard-plastic-heavy and behind German rivals at a premium price point; 8-inch SYNC 3 and the optional 12-inch digital cluster helped, but material richness lags what buyers get at similar prices elsewhere.

Flat Rock production of the S550 by 2021 was a mature build with generally consistent assembly, though the convertible body style adds structural cowl-shake, top-mechanism wear points, and higher rattle/wind-noise complaint density than the coupe.

Ford operates one of the densest US dealer networks (~2,900 dealers) with nationwide service coverage — easy access anywhere in the country, though J.D. Power CSI scores put Ford service satisfaction at mid-pack.

The Mustang has arguably the largest aftermarket support of any modern American car, and by 2026 the 2021 S550 is deep into cheap, abundant parts territory — OEM and aftermarket alike are inexpensive and everywhere; convertible-specific top components remain dealer-sourced but rarely fail early.

The 2021 S550 Mustang Convertible carries an 8-inch SYNC 3 center touchscreen standard on every trim (EcoBoost, EcoBoost Premium, GT Premium); no larger screen was offered — SYNC 4 with the 13.2-inch display did not arrive on Mustang until the 2024 S650.

SYNC 3 was widely praised through its lifecycle as one of the better mainstream infotainment systems — fast, uncluttered menus, and (critically) preserved a full row of physical climate and volume/tune knobs beneath the screen. By 2021 it was aging against newer competitors but still highly usable day-to-day.

The 2021 Mustang offered WIRED Apple CarPlay and WIRED Android Auto standard across all trims — wireless phone projection was not available on SYNC 3 in Mustang, arriving only with SYNC 4 in the 2024 S650.

SYNC 3 voice recognition handled basic phone/audio/climate commands adequately but was not natural-language; embedded navigation was optional (bundled in the SYNC 3 Nav / Premium packages) and functional but generally bypassed by owners in favor of CarPlay/Google Maps.

Base 6-speaker system is thin; the optional B&O Play by Bang & Olufsen 12-speaker premium audio (standard on GT Premium, available on EcoBoost Premium) delivers respectable sound and remains one of the stronger premium options in the segment, though top-down environment always caps convertible audio realism.

The volume 2021 Convertible trim (EcoBoost Premium) still uses an analog gauge cluster flanking a 4.2-inch color productivity screen; the fully digital 12-inch configurable cluster with Fox Body/heritage themes was standard only on the Mach 1 and optional as part of the Digital Instrument Cluster package on GT Premium — not the volume configuration.

SYNC 3 in the 2021 Mustang supports Wi-Fi map updates for embedded navigation but has no whole-vehicle over-the-air update capability — Ford Power-Up OTA (which adds vehicle-module updates) launched on Mach-E and later F-150 but did not extend to 2021 Mustang.

FordPass on the 2021 Mustang (via FordPass Connect embedded modem) offered remote start, lock/unlock, vehicle status, fuel/location, and service scheduling — core functionality was solid and included with a multi-year Connected Services trial, though the app itself was less polished than 2024+ versions.

The 2021 Mustang provides front USB-A + USB-C ports and a 12V outlet, with a wireless phone-charging pad optional on Premium trims (Premier Trim Package). USB-C was the newer 'smart' port for charge/data. Ports are adequate but dated by modern standards, and there's no household outlet — typical for the segment.

Intelligent Access proximity entry with push-button start is standard on the Premium trims that make up virtually all 2021 Mustang Convertible sales (EcoBoost Premium, GT Premium), and FordPass Connect enables remote start via the phone app. No phone-as-key on Mustang for 2021.

Rear-view camera is standard on all 2021 Mustangs and Reverse Sensing System (rear parking sensors) is available on Premium trims — but there is no front parking sensor option, no surround-view camera, and no automated parking. A real gap for a wide-hipped convertible whose top-up rearward visibility is compromised.

Ford did not offer a head-up display on the 2021 Mustang on any trim (coupe or convertible) — a capability gap versus premium European convertible rivals like the BMW Z4 and BMW 4 Series Convertible which offered HUD in this era.

Two-door soft-top with ~30.6 in of rear legroom and long, heavy doors that swing wide in tight parking. LATCH anchors are provided at the outboard rear positions, but a rear-facing seat forces the front seat far forward and the tall fabric header with the top up makes buckling in a child awkward. Access is only marginally easier with the top down; regularly frustrating for daily family logistics.

Ford Co-Pilot360 is standard on all 2021 Mustangs: Pre-Collision Assist with AEB and pedestrian detection, BLIS with cross-traffic alert, lane-keeping system, auto high-beam, and rear-view camera. Adaptive cruise and evasive steer assist require the optional Co-Pilot360 Assist+ package. NHTSA rates the 2021 Mustang coupe 5-star overall, but the convertible is not separately rated and IIHS does not name any Mustang a Top Safety Pick; open-top structural crashworthiness data is limited.

Front seats are supportive over long distances, but 30.6 in of rear legroom and the thick soft-top structure make the back seat unusable for adults or older children beyond short hops. No rear climate vents, no rear USB port on the volume EcoBoost trim, and top-up wind/road noise raises fatigue further. The 11.4 cu ft trunk (down from 13.5 on the coupe) will not swallow four people's long-weekend luggage.

The volume EcoBoost pairs a 310-hp 2.3L turbo with a well-sorted 10-speed automatic that is smooth in traffic and comfortable on standard 18-in wheels. With the top up, the small rear window and thick fabric quarters create significant blind spots on top of the wide (75.4 in) body. SYNC 3 with CarPlay/Android Auto is standard, but adaptive cruise remains optional on base EcoBoost. Top down helps visibility but is weather-dependent for daily use.

The volume 2021 EcoBoost automatic returns 21/32/25 mpg on the EPA cycle — reasonable for a rear-drive sports car but nothing exceptional. Runs on regular fuel; the GT drops to 16/24/19 mpg with premium recommended, pushing annual fuel cost well above $2,650. Performance tires, brakes, and Ford dealer service on a specialty convertible run above mainstream commuter cars.

At 188.3 in long, 75.4 in wide, and with a ~40 ft turning circle, the convertible has essentially the same footprint as the coupe — a mid-size two-door that feels large in urban lots. Top-up rear visibility is worse than the coupe because the small back window and fabric quarter panels close in the over-shoulder view. Standard rear-view camera helps, but no factory 360-degree camera is offered on any 2021 trim.

Not rated for towing in the US — Ford does not publish a factory tow capacity for the 2021 Mustang, and dealer-installed hitches are for bike racks only. No bed, no meaningful payload, and only 11.4 cu ft of trunk with a shallow aperture (worse than the coupe's 13.5). There is essentially no work capability of any kind.

The Coyote 5.0L V8 and EcoBoost drivetrain are proven and Ford's dealer network is broad, but the convertible adds a power fabric roof and its motors/latches to the maintenance ledger and offers no wash-out cargo area. Interior is trimmed in cloth/ActiveX/leather with low-profile tires. No fleet reputation and not marketed for hard-use duty.

No factory 120V outlet, no factory tow hitch, no roof-rack system (the roof is a folding fabric top), no bed or bed-substitute. Cargo tie-downs are limited to a few small hooks in the trunk. Even less upfit-friendly than the coupe — the folding roof precludes rack accessories.

Front sport seats are comfortable over long hauls and the 10-speed auto's tall top gears settle the cabin at highway cruise. The EcoBoost's 16-gal tank at 32 hwy mpg gives ~510 mi of highway range; GT drops to ~380 mi on premium at 24 hwy. Top-up wind and tire noise are markedly higher than the coupe, and adaptive cruise is optional rather than standard on the volume trim, limiting fatigue reduction on multi-hour drives.

Rear-wheel drive only — no AWD offered — ~5.0 in of ground clearance, low-profile summer or all-season performance tires, no roof rails (folding roof), and no factory hitch. Open-air appeal for scenic-drive adventures is genuine, but any gravel road with real texture will scrape the front splitter, and the convertible is more exposed to weather than the coupe. Pavement-bound with very little outdoor utility.

11.4 cu ft trunk (down from 13.5 on the coupe) with a shallow lid opening, and no fold-down rear seat pass-through — the convertible's soft-top mechanism precludes it. No roof rails, no factory hitch, and no hatchback flexibility. Two soft-side weekend bags fit; skis, bikes, or bulky gear require an aftermarket trunk-mounted rack.

Shares the S550's double-ball-joint MacPherson front and integral-link IRS with the coupe, and the volume GT Convertible with the Performance Package is composed at real speeds — but pays a clear convertible tax. The chopped-roof body carries roughly 100 lb more (steel underbody bracing, chassis reinforcement) and reviewers consistently note cowl shake and secondary body motions over broken pavement that the coupe doesn't have. Compounding the year: Ford switched the GT PP tire spec from Michelin Pilot Sport 4S (2018–2020) to Pirelli P-Zeros for 2021, which reviewers flagged as an outright grip step-back, and the halo 2021 Mach 1 (1.10 g skidpad) is coupe-only, so no convertible variant inherits its dynamics gains. Places it below the coupe (70) and well below Cayman (80.1), Z4 (77.9), and Miata (77.9).

Same S550 electric power steering as the coupe with Comfort/Normal/Sport modes — precise and consistent weighting but famously numb, a weakness Ford's own S650 chief engineer publicly acknowledged. The convertible knocks it a notch further because the less-rigid structure telegraphs cowl shake through the rim on broken pavement, muddying the on-center feel that Sport mode is trying to build. Adequate for daily driving; a step behind Porsche/BMW/Nissan Z for real feedback and clearly behind the coupe.

Base GT Convertible gets the coupe's 13.9-in front / 13.0-in rear rotors with 4-piston front calipers — firm pedal, competent stops. GT with Performance Package adds larger front rotors and 6-piston Brembos and stops in the low 100s of feet from 60 mph in coupe testing. Convertible carries the extra structural mass over identical hardware, so repeated hard stops fade slightly sooner and it can't access the Mach 1's GT350-derived brakes (coupe-only in 2021). Sits just below the coupe's 74.

Identical Gen 3 5.0L Coyote V8 (460 hp / 420 lb-ft) or 2.3L EcoBoost as the coupe. V8 is torque-rich from idle, free-revs to 7,500 rpm with no perceptible lag, and the 10R80 10-speed automatic shifts crisply. The MT-82 6-speed manual with rev-match is engaging if slightly notchy. EcoBoost 2.3T pulls hard but is coarser under load and shows more 10AT hunt. Convertible has no meaningful drivability delta versus the coupe.

Roof-down amplifies the standard Active Valve Performance Exhaust (Quiet/Normal/Sport/Track modes) — the Coyote V8 soundtrack is one of the great character notes at this price and is a defining reason to buy the Mustang GT Convertible specifically. Vibration through the wheel and pedals is low at cruise; top-up highway drone is a bit more prominent than the coupe, but enthusiasts count roof-down exhaust access as a net positive, so it grades above the coupe's 74.

Ford's published S550 curb-to-curb turning diameter carries across body styles at 37.8 ft — the convertible uses the identical 107.1-in wheelbase and steering geometry as the coupe. Mid-band for the convertible class and better than the S650's 40.0 ft figure.

S550 interior offers a low, buckets-forward driving position with supportive standard front seats and a generous tilt/telescoping range. Convertible improves on the coupe for roof-down visibility (the fastback's thick C-pillars simply aren't there) but roof-up over-the-shoulder visibility is worse than the coupe due to thick fabric quarters and a small heated glass rear window. Downsides carry over: 8-inch SYNC 3 touchscreen is small for 2021, hard lower-dash plastics, no power seat recline. Nets out marginally below the coupe's 68.

The GT Convertible is the archetypal top-down American V8 experience — rear-wheel drive, 460-hp naturally aspirated Coyote, available Tremec-toughened 6-speed manual with rev-match, and that exhaust note at full volume with the roof stowed. Character, sound, and responsiveness combine into a definitive 'long-way-home' car and the roof-off soundtrack meaningfully lifts it above the coupe on visceral appeal, even though the coupe wins on outright dynamics (Mach 1 halo). Only mid-engine Cayman/Boxster and top-tier BMW/Porsche roadsters clearly edge it on pure driver engagement.

The 2021 EcoBoost Convertible offered a competitive but not loaded base spec — SYNC 3 with an 8-inch touchscreen, cloth seats, LED headlamps, and Ford Co-Pilot360 driver-assist bundle were standard, but the 12-inch digital cluster, adaptive cruise, and B&O premium audio required Premium trims or option packages. Analog gauges with a 4.2-inch center display remained the base cluster mid-cycle in the S550 generation.

Standout bang-for-buck: the 2021 GT Premium Convertible delivered a 460 hp naturally-aspirated 5.0L V8 for about $45k when the BMW M440i xDrive cabrio started near $58k with 382 hp and the Porsche 718 Boxster near $62k with 300 hp — the only mainstream V8 convertible on sale, with unmatched horsepower-per-dollar in the drop-top class.

2021 Convertible spanned EcoBoost, EcoBoost Premium, GT, and GT Premium with a 310 hp turbo-four or 460 hp V8, plus the returning California Special package and manual-or-auto choice on the GT — a well-spaced ladder, though the new-for-2021 Mach 1 (which replaced the outgoing Bullitt) and the Shelby GT500 halo were coupe-only, so the Convertible lineup topped out at GT Premium.

2021 Mustang US sales reached ~52,400 units — up modestly from 2020 and again the best-selling sports coupe/convertible in the world for the seventh year running. Outsold by the Challenger, but comfortably ahead of the Camaro and dominant globally.

The Mustang nameplate was already one of the strongest halo brands in the American market by 2021 — 57 years of continuous production, a deep enthusiast following, and the V8 convertible variant remained a bucket-list car for many buyers. J.D. Power awarded it Most Appealing Midsize Sporty Car that year.

Early 2021 offered typical Ford incentives (a few thousand off MSRP plus special APR programs on Mustang), but the semiconductor shortage tightened supply through the second half of the year, thinning discounts and pushing some dealers toward MSRP. Better buyer leverage than the peak-shortage 2022 model year but well off the pre-COVID norm.

The S550 generation launched for 2015 and received its mid-cycle refresh for 2018, so 2021 was the fourth year post-refresh and the seventh year of the platform — current but not cutting-edge, with SYNC 3 already a generation behind rivals' latest infotainment. No successor was publicly confirmed yet (the S650 was not revealed until September 2022), so buyers did not face immediate obsolescence risk.

The 2021 Mustang was widely praised for its V8 charm, straight-line pace, and drop-top value, and J.D. Power named it #1 for Initial Quality and APEAL in the Midsize Sporty Car segment — but reviewers frequently picked the Camaro for handling refinement and knocked the Mustang for a plasticky interior and coarse ride in direct comparisons through the middle of the S550 cycle.