Roush® 421387 - (11-14) Mustang GT Phase 1 Upgrade Kit 575HP
Roush® 421387 - (11-14) Mustang GT Phase 1 Upgrade Kit 575HP


Roush® (11-14) Mustang GT Phase 1 Upgrade Kit 575HP

Regular price$582.99
Shipping calculated at checkout.
  • Free Shipping USA (Exc. HI, AK, PR)

Compatible: (5.0L)

2011 - 2014 Ford Mustang GT



Product highlights for the 5.0L ROUSH Phase 1 Supercharger Mustang 575HP Upgrade Kit:

  • 575 Horsepower and 505 lb-ft of torque (upgrade to previous 525hp or 540hp kits/vehicles)
  • NOW 50 States emission legal for 2011-2014 / CARB E.O.# D-418-23
  • Available for manual and automatic transmission
  • 85mm S/C Pulley
  • 2085mm FEAD Belt
  • To be downloaded using the ROUSH Diagnostic Tool (RDT) software.
  • Works with 2011-2014 Ford 5.0L Mustangs equipped with the ROUSH 5.0L supercharger kits producing 525 or 540 horsepower
  • Maintains original 3 Year/36,000 Mile Powertrain/Drivetrain warranty.

The 575 HP ROUSH Phase 1 Supercharger Upgrade Kit includes all of the necessary components to increase your 525 HP or 540 HP Ford Mustang to 575 HP and 505 lb-ft. The supercharger upgrade kit comes with a new 85mm S/C Pulley, Shorter FEAD Belt ROUSH Flash Vouchercardand Installation Instructions.

The ROUSH 2011-2014 Mustang Supercharger 575 Upgrade Kit is part of the TVS (Twin Vortices Series) family line of superchargers developed by ROUSH that have raised the bar for performance and reliability. The TVS supercharger is the same line that has been used and proven for years in ROUSH-built Ford Mustangs. Easily upgrade the horsepower and torque of your 2011 to 2014 ROUSH supercharged 5.0L Mustang.

This part now utilizes the ROUSH Flash Voucher card to be calibrated using the ROUSH Diagnostic Tool (RDT) software and pass-thru device. If you do not have access to an approved pass-thru device, you can send your PCM back to ROUSH to be flashed for an additional $100.00 fee.

Please contact Customer Care at 800.59.ROUSH if you have any questions

WARNING: Cancer and Reproductive Harm -






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