Borla S-Type Cat-Back 19-20 Chevrolet Silverado Side Exit Exhaust - Black Chrome TipFactory Single Side Exit vehicles ONLY. Add Adapter 60708 For Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles. This 3" Cat Back(tm) system with the S Type sound level will give your 2. 7L Silverado and Sierra the right sound and performance without any of the annoying drone often found in four cylinder applications. The system is tuned for flow and sound on the turbo four cylinder engine of the GM 1500 trucks. This system features a single