Roush Performance
Supercharger Single Belt, Upgrade Phase1-2 2005-2009 Ford Mustang 421101
Converts Phase 1 Single Belt 2005-2009 Mustang Supercharger to a Phase 2 system Increases power to 550 hp / 500 lb-ft Not CARB approved -- not for sale in California or other "green" states Requires the Single Belt Phase 1 2005-2009 Mustang GT Supercharger (part #421099) Only works with manual transmission Part #421101
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