Quick view Roush ROUSH 2011-2014 Ford Mustang GT 5.0L Phase 2-to-Phase 3 675HP Supercharger Upgrade Kit - 421597 Compare $1,199.99 Boost the power and performance of your 2011-2014 5.0L Mustang Phase 2 ROUSHcharger with the ROUSH Performance Phase 2 to Phase 3 Supercharger Upgrade Kit. This kit brings your 625 hp/525 lb-ft ROUSH supercharger to a tire-shredding 675 hp and 585 lb-ft... Add to Cart Add to Cart