S550

2021 Ford Mustang Facts

The 2021 U.S. S550 lineup replaced Bullitt and GT350 with the returning 480-hp Mach 1 while GT500 remained the halo; Ford's available totals are calendar-year plant and sales evidence, not model-year production.

Flat Rock calendar-year production
65,590
Buyers Guide Owner guide Codes & troubleshooting

Image Gallery

2021 Ford Mustang Shelby GT500 (S550) Front (Bahrain)
2021 Ford Mustang Shelby GT500 (S550) Front (Bahrain) Coupe / Shelby GT500 The 2021 Shelby GT500's stance, trim, and model-year exterior details are clear in this photo. Photo: Mohammed Hamad · Source · CC BY-SA 4.0
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Mohammed Hamad
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Open source record
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CC BY-SA 4.0; this web adaptation is offered under the same ShareAlike license.
Changes
Auto-oriented, resized, and metadata removed for web display.
2021 Ford Mustang Shelby GT500 (S550) Rear (Bahrain)
2021 Ford Mustang Shelby GT500 (S550) Rear (Bahrain) Coupe / Shelby GT500 The 2021 Shelby GT500's stance, trim, and model-year exterior details are clear in this photo. Photo: Mohammed Hamad · Source · CC BY-SA 4.0
Image rights & changes
Creator
Mohammed Hamad
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Open source record
Use basis
CC BY-SA 4.0; this web adaptation is offered under the same ShareAlike license.
Changes
Auto-oriented, resized, and metadata removed for web display.
Ford Mustang Mach1, 2021 front
Ford Mustang Mach1, 2021 front Coupe / Mach 1 The 2021 Mach 1's stance, trim, and model-year exterior details are clear in this photo. Photo: EurovisionNim · Source · CC BY-SA 4.0
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Creator
EurovisionNim
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Open source record
Use basis
CC BY-SA 4.0; this web adaptation is offered under the same ShareAlike license.
Changes
Auto-oriented, resized, metadata removed, and visible license plates blurred.

Overview

Production Breakout

Model / Body Style Units Type
Mach 1 Disputed: 6,323 Special edition
Shelby GT500 Disputed: 4,265 Special edition

Ford's 65,590 calendar-year Flat Rock output leads. Ford's 52,414 U.S. sales and the 64,473 partial regional compilation remain separate; none is final 2021 model-year production, and Mustang Mach-E is excluded from this family slice.

Why published totals differ

65,590 Ford Motor Company Mustangs assembled at Flat Rock during calendar year 2021. Calendar-year plant production can span more than one model year.
52,414 Ford Motor Company United States Mustang sales during calendar year 2021, excluding Mustang Mach-E. Sales are deliveries, not production; Ford reports Mustang Mach-E separately.
Reported: 64,473 Fixed Wikipedia regional-table compilation Sum of selected regional sales columns in the fixed Ford Mustang sixth-generation revision, 2021 row. A partial regional compilation, not complete production or a model-year total.

Engines & Power

Code Engine Induction HP Torque Availability
99H 2.3L EcoBoost I-4 Turbocharged direct injection 310 350 EcoBoost and EcoBoost Premium fastback and convertible groups.
99D 2.3L High Performance EcoBoost I-4 Turbocharged direct injection 330 350 2.3L High Performance Package (67E) configurations.
99F 5.0L Ti-VCT V8 Port and direct fuel injection 460 420 GT and GT Premium fastback and convertible groups.
990 5.0L Mach 1 Ti-VCT V8 Naturally aspirated 480 420 Mach 1 groups 600A and 700A.
99J 5.2L Supercharged cross-plane-crank V8 Supercharged 760 625 Shelby GT500 group 950A; supplement technical rating leads.

Specifications

Options & Packages

Counts distinguish verified production records, attributed reports, disputed figures, announced limits, and figures that do not survive in available records.

Option or package Ford code Market Availability Units Count status
EcoBoost Equipment Groups Base, High, Premium, and Premium Plus EcoBoost groups. 100A / 101A / 200A / 201A United States EcoBoost and EcoBoost Premium arrays. Not publicly published No public total found
GT Equipment Groups Base, High, Premium, and Premium Plus GT groups. 300A / 301A / 400A / 401A United States GT and GT Premium arrays. Not publicly published No public total found
Mach 1 Equipment Groups Mach 1 High and Deluxe groups. 600A / 700A United States Mach 1 fastback P8R. Not publicly published No public total found
Shelby GT500 Equipment Group GT500 identity group. 950A United States Shelby GT500 P8S. Not publicly published No public total found
2.3L High Performance Package 330-hp engine and supporting chassis, braking, cooling, wheel, and aero content. 67E United States Eligible EcoBoost configurations with engine 99D. Not publicly published No public total found
EcoBoost Handling Package MagneRide, Brembo brakes, Torsen axle, wheels/tires, and chassis tuning. 60H United States Fastback with package 67E and guide restrictions. Not publicly published No public total found
GT Performance Package GT performance chassis package. 67G United States Eligible GT configurations. Not publicly published No public total found
Mach 1 Handling Package Wider wheel/tire, aero, chassis, and adjustable-strut-mount package. 60K United States Mach 1 600A and 700A with guide restrictions. Not publicly published No public total found
Mach 1 Elite Package Audio and enhanced-security package. 67D United States Mach 1 groups with guide restrictions. Not publicly published No public total found
Mach 1 Appearance Package Fighter Jet Gray paint, orange accents/calipers, and unique stripes and interior. 54A United States Mach 1 700A with guide restrictions. Not publicly published No public total found
GT500 Carbon Fiber Track Package Carbon wheels, track aero, Cup 2 tires, Recaros, and rear-seat delete. 67J United States GT500 950A with guide restrictions. Not publicly published No public total found
GT500 Handling Package Gurney flap, splitter wickers, and adjustable strut mounts. 67K United States GT500 950A with guide restrictions. Not publicly published No public total found
GT500 Carbon Fiber Handling Package Carbon-fiber wheels and handling hardware without the full CFTP configuration. 67Q United States GT500 950A with guide restrictions. Not publicly published No public total found

Buyer Identification

Special & Tuner Models

Mach 1

Production
Disputed: 6,323 MustangCarFacts inherited 2026 reference corpus Inherited 2021 Mach 1 report; market and inclusion rules were not recorded. No count-bearing external source was retained.
The inherited 6,323 report is disputed and is not added to calendar-year plant or sales totals.
Identity Returning 480-hp track-focused model between GT and GT500, with engine 990 and groups 600A/700A.
Identification Require P8R, group 600A or 700A, engine 990, configuration-correct equipment, and Ford documentation.

Shelby GT500

Production
Disputed: 4,265 MustangCarFacts inherited 2026 reference corpus Inherited 2021 Shelby GT500 production report. No count-bearing external source was retained.
The inherited 4,265 report is disputed and is not added to calendar-year plant or sales totals.
Identity 760-hp supercharged GT500 with engine 99J and DCT 44G.
Identification Require group 950A, engine 99J, DCT 44G, configuration-correct equipment, and Ford/SVT documentation.

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Additional Notes

Owner Finds

As an Amazon Associate MustangCarFacts.com earns from qualifying purchases. These links open Amazon searches, so verify fitment, licensing, seller, price, and availability before buying.

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Year-Correct Floor Mats

A tidy first upgrade for a driver-quality car: look for well-reviewed, properly fitting mats with licensed Mustang branding and heel-pad durability.

Shop 2021 Mustang logo floor mats
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Indoor or Outdoor Car Cover

Good fit for storage season, garage dust, and weekend cars that spend more time being preserved than parked outside the diner.

Shop 2021 Mustang fitted car cover
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Mustang Keychain or Jewelry

A small owner gift with a lot of emotional mileage: keychains, lapel pins, cufflinks, and other Mustang-logo keepsakes.

Shop 2021 Mustang logo keychain jewelry
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Model-Specific Parts

A focused search for trim pieces, emblems, decals, weatherstripping, or specialty hardware tied to the exact year and featured model.

Shop 2021 Mustang Mach 1 parts accessories

Sources

  1. Ford 2021 Mustang brochure
  2. Ford 2021 Mustang Shelby GT500 supplement
  3. Ford 2021 Mustang Mach 1 supplement
  4. Ford 2021 Mustang order guide
  5. Ford Motor Company December 2021 U.S. sales report
  6. Ford 2021 Shelby GT500 order guide
  7. 2015 Ford Mustang GT review
  8. Ford Mustang sixth-generation reference
  9. MustangCarFacts inherited 2026 reference corpus