EXCEPT ZR2 & AT4X models. Fits Factory Split Rear Exit Vehicles ONLY. BORLA® system has a Valve Simulator Add Adapter 60706 for Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles Polyphonic Harmonizer 60680 can be added to this system to attain the ATAK® sound level Installation REQUIRES removal of the Factory Valance Tips See below for product Features & Benefits