The 1999 Saleen S351 was one of the most powerful, exclusive, and expensive Mustangs of its era. Its supercharged 5.8-liter V8 produced 495 horsepower, while its upgraded brakes, suspension, transmission, and bodywork went far beyond a typical appearance package.
Only 46 examples were reportedly built for the model year, making it a serious collector car today. It also marked the final model year for the original S351 series. That combination of power, rarity, and historical importance explains why clean examples can command far more than an ordinary 1999 Mustang.
| Key fact | Detail |
| Base vehicle | 1999 Ford Mustang |
| Engine | Supercharged and intercooled 5.8-liter V8 |
| Factory output | 495 horsepower and 490 lb-ft of torque |
| Transmission | Six-speed manual |
| Drivetrain | Rear-wheel drive with limited-slip differential |
| Reported production | 20 coupes and 26 convertibles |
| Period tested 0–60 mph | 4.7 seconds |
| Period tested quarter-mile | 13.0 seconds at 111.7 mph |
| Original tested price | About $57,550, depending on equipment |
What Made The 1999 Saleen S351 Different?
Saleen didn’t treat the 1999 Saleen S351as a standard Mustang with wheels, stripes, and a louder exhaust. The company changed the engine, drivetrain, chassis, brakes, aerodynamics, interior details, and instrumentation. The model used a 351-cubic-inch Windsor-based V8 rather than the 4.6-liter modular engines found in contemporary
Mustang GT and Cobra models. MotorTrend reported that the engine was related to the unit used in the mid-1990s Ford Lightning pickup. Saleen added forced induction and extensive internal upgrades to create its flagship Mustang.
A period equipment list included:
- A centrifugal supercharger and intercooler
- Forged engine internals
- Aluminum cylinder heads
- A performance camshaft
- Modified intake and exhaust systems
- An oil cooler and revised engine calibration
- A Borg-Warner T-56 six-speed manual transmission
- Saleen Racecraft suspension components
- Large front brakes with four-piston calipers
- Staggered 18-inch wheels and performance tires
Saleen also fitted model-specific bumper covers, side skirts, scoops, graphics, a rear wing, and a lightweight hood. Serialized exterior and interior plaques helped identify each car as a genuine Saleen-built vehicle.
1999 Saleen S351 Engine And Performance
The headline figure was 495 horsepower at 5,400 rpm. Torque reached 490 lb-ft at 3,500 rpm. Those numbers placed the car close to the 500-horsepower mark when many mainstream performance cars produced less than half that output.
MotorTrend recorded a 4.7-second run from zero to 60 mph. The car covered the quarter-mile in 13.0 seconds at 111.7 mph. It also generated 0.93 g on the skidpad, stopped from 60 mph in 109 feet, and completed the publication’s slalom at 70.7 mph.
Those results remain quick, but the figures tell only part of the story. Period testers noted that controlling wheelspin was a major part of launching the 1999 Saleen S351. The car sent nearly 500 horsepower through the rear wheels of a late-1990s Mustang platform without modern launch control or today’s advanced stability systems. That makes the driving experience more demanding than the numbers may suggest. Power delivery, tire condition, road temperature, and driver restraint all matter. More from us: Diablo Lamborghini GTR.
How Rare Is the 1999 Model?
Production records published by the Saleen Owners and Enthusiasts Club list 20 coupes and 26 convertibles for 1999. That gives the model year a reported total of 46 cars. The same records show no later S351 production, making 1999 the end of the original series. By comparison, Saleen built far more S281 models during the same period. The lower-production flagship therefore occupies a different part of the collector market.
Rarity alone doesn’t guarantee value. Yet low production becomes meaningful when it’s paired with:
- A distinctive factory-authorized identity
- A documented serial number
- A unique engine configuration
- Strong performance for its era
- A final-year production story
- Surviving paperwork and original components
Body style, color, factory options, mileage, and documentation can make one example more desirable than another. A rare color or well-documented Speedster may attract a different buyer than a higher-mile coupe.
Coupe, Convertible, and Speedster Differences
The coupe offers the most traditional high-performance layout. Its fixed roof can also appeal to owners who prioritize structural rigidity and a simpler ownership experience. The 1999 Saleen S351 convertible adds open-air driving and was slightly more common in 1999, based on the published production totals. Some convertibles were configured as Speedsters with distinctive tonneau covers, roll bars, and other appearance details.
A documented 2,500-mile Speedster offered in 2024 included a removable hardtop, removable tonneau cover, roll bar, Recaro seats, Saleen bodywork, and a certificate of authenticity. The listing also described the same 495-horsepower engine and six-speed drivetrain.
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| Version | Main appeal | Potential buyer concern |
| Coupe | Fixed-roof performance and lower reported production | Finding an original, unmodified car |
| Convertible | Open-air driving and limited production | Roof condition, seals, and chassis wear |
| Speedster | Distinctive styling and added collector interest | Missing tonneau, hardtop, or model-specific parts |
What Is a 1999 Saleen S351 Worth?
There isn’t one reliable price for every car. Mileage, history, body style, originality, condition, color, options, and documentation can produce large differences. One useful public result comes from a 1999 coupe sold through Bring a Trailer in February 2022. The 29,000-mile car sold for $71,000. It was described as number 15 of approximately 20 coupes built and included its window sticker, original paperwork, Saleen literature, and a Marti report.
That result should be treated as a comparable sale, not a fixed appraisal. The collector-car market changes, and two cars from the same production run can sell for different amounts. As a practical rule, the strongest examples tend to combine low mileage with clear provenance. Cars that retain original body panels, correct wheels, serial plaques, factory equipment, and supporting records usually inspire more buyer confidence.
How to Verify a Genuine Example?
Authenticity should be checked before price negotiations. Badges and body kits can be copied, while a genuine vehicle should have a consistent chain of identifying details.
- Inspect the Saleen serial numbers. Check the exterior number and interior plaque for consistency.
- Confirm the VIN. Match it against the title, vehicle records, and Saleen documentation.
- Review the engine installation. Verify the correct supercharged 5.8-liter setup and major supporting components.
- Check the body equipment. Look for correct fascias, hood, side skirts, scoops, wing, wheels, and graphics.
- Request supporting records. A window sticker, certificate, invoices, brochures, or previous sale records can strengthen provenance.
- Arrange a specialist inspection. Choose a shop familiar with Saleen vehicles and modified Windsor engines.
Documentation deserves extra attention because many Mustangs have received aftermarket Saleen-style parts. A convincing replica may look correct in photographs but lack the history that supports collector value. Explore our homepage for the latest automotive insights, car reviews, and expert vehicle guides
Mechanical Checks Before Buying
A pre-purchase inspection should cover more than paint quality and mileage. These cars are now more than 25 years old, and age can affect lightly driven examples as much as high-mile cars.
Ask the inspector to examine:
- Supercharger condition, belt alignment, and boost behavior
- Cooling-system health and signs of overheating
- Oil leaks and crankcase pressure
- Fuel-system condition
- Clutch operation and six-speed shift quality
- Differential noise and axle condition
- Brake calipers, rotors, hoses, and replacement-part availability
- Suspension bushings, shocks, struts, and alignment
- Tire age, not only tread depth
- Convertible-top or removable-roof seals
Car and Driver’s archived evaluation praised the model’s durability during hard testing, but its reviewers also described a stiff shifter and difficulty selecting reverse. That period observation gives buyers another area to examine during a test drive.
Why Collectors Care About It?
The 1999 Saleen S351sits at an unusual point in Mustang history. Ford had moved toward modular V8 power, yet Saleen retained a large-displacement pushrod engine for its flagship. The result combined old-school Windsor character with late-1990s supercharging, six-speed gearing, and specialized chassis hardware.
Saleen’s own history page identifies 1999 as the year it unveiled redesigned S281 and S351 models with a new appearance and higher performance. That gives the final S351 a clear place in the company’s product timeline. Its appeal comes from more than rarity. It represents a period when a specialist manufacturer could transform a mass-produced pony car into a limited-production machine with near-500-horsepower output.
Is the 1999 Saleen S351 a Good Buy?
It can be an excellent collector purchase for the right owner. The best candidate is someone who values documented rarity, analog performance, and Saleen history more than modern convenience.
It may not suit a buyer seeking a simple daily driver. Model-specific components can be difficult or expensive to replace. A poorly modified or incomplete car may also require extensive research and restoration work.
The strongest purchase is a verified example with:
- Consistent serial and VIN documentation
- A specialist inspection
- Original or period-correct equipment
- Known service history
- No major accident or corrosion concerns
- A price supported by comparable sales
Before buying, compare several cars rather than relying on a single auction result. Condition and provenance should guide the decision more than mileage alone. For buyers focused on efficiency and practicality, explore our guide to the Best MPG SUV for 2026 to compare the latest fuel-efficient SUV options.
Final Verdict
The 1999 flagship wasn’t a cosmetic Mustang package. It was a low-production performance car with a supercharged 351-cubic-inch engine, a six-speed manual, upgraded chassis hardware, and an identity of its own. For collectors, the 1999 Saleen S351 offers an appealing mix of final-year significance, analog driving character, and genuine rarity. Focus on authenticity and documentation first. The best-preserved examples are unlikely to become easier to find.
Frequently Asked Questions
The factory-rated supercharged model produced 495 horsepower and 490 lb-ft of torque. It used a 5.8-liter V8 paired with a six-speed manual transmission.
Published Saleen enthusiast-club production data lists 20 coupes and 26 convertibles, for a reported total of 46 vehicles.
MotorTrend recorded zero to 60 mph in 4.7 seconds and a 13.0-second quarter-mile at 111.7 mph. Traction limited the car’s launch performance.
It began as a Ford Mustang, but Saleen completed extensive engine, drivetrain, suspension, brake, body, and interior modifications. Finished cars carried Saleen serial numbers and identifying plaques.
Verify its serial numbers, VIN, engine configuration, body equipment, documentation, accident history, and service records. A specialist pre-purchase inspection is strongly recommended.
It was the final production year for the original S351 line. Its reported 46-car production total and 495-horsepower output give it strong historical and collector appeal.
