Saleen Saleen Supercharger System – 1999–2004 Mustang 4.6L 2V (S281 Replacement)

Replace or upgrade the factory Saleen S281 Mustang supercharger with the Saleen-approved replacement system for the 1999–2004 Mustang GT. Engineered for the 4.6L 2-valve modular V8, this system delivers significant performance gains with OEM-level drivability and reliability. It is the recommended OE replacement for Saleen S281 models originally equipped with the 2.1 twin-screw unit, while fitting all 1999–2004 Mustangs with the 4.6L 2V engine.

Power gains range from +160 RWHP at 9 PSI to as much as +262 RWHP at 14 PSI, transforming the Mustang GT into a true Saleen-level performer. The kit includes an intercooled twin-screw supercharger, Boost-a-Pump, fuel injectors, billet fuel rails, bypass valve, and chip calibration. Saleen’s proprietary calibration provides OEM-grade tuning, ensuring smooth operation and consistent performance without the need for expensive custom tuning.

Two fitment configurations are available: one for 1999–2000 Mustang GT models and one for 2001–2004 Mustang GT. Both versions feature a self-contained oiling system, instant boost delivery, and quiet operation, all hallmarks of the proven Kenne Bell twin-screw design. The intercooled design maximizes efficiency, lowers intake temperatures, and provides reliable power across the entire RPM range.

• Recommended OE replacement for 1999–2004 Saleen S281 Mustang supercharger
• Fits all 1999–2004 Ford Mustang GT 4.6L 2V (two configurations: 1999–2000 or 2001–2004)
• +160 RWHP at 9 PSI, +204 RWHP at 10 PSI, +262 RWHP at 14 PSI
• Intercooled twin-screw design for maximum efficiency
• Includes Boost-a-Pump, injectors, billet fuel rails, bypass valve, and chip calibration
• Self-contained oiling system for long service life
• Instant boost with flat torque curve across the RPM range
• 50-state legal up to 9–10 PSI (14 PSI kits not emissions legal)
• Direct bolt-on system, no internal engine modifications required

Note: Professional installation and premium fuel (91–93 octane) required. Horsepower results may vary by conditions, altitude, and dyno type.