Fitment and Tuning: this Y-pipe will only fit 2011-2014 F150 5.0Ls with Kooks 1-3/4" Long Tube Headers or Kooks 1-7/8" Long Tube Headers. Custom tuning is required for the installation and operation of this Y-pipe.
48-State Street Legal Catalytic Converters: the Kooks GREEN Cats are EPA-certified and will pass emissions testing in states that have not adopted CARB air quality guidelines. These cats are not street legal in California, New York, or other areas that have adopted CARB regulations. If you have any questions, give us a call directly at 1-877-578-2433.