Borla S-Type Cat-Back 19-20 Chevrolet Silverado Side Exit ExhaustBorla S Type Cat Back 19 20 Chevrolet Silverado Side Exit Exhaust Factory Single Side Exit vehicles ONLY. The 140800 Cat Back(tm) system 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 Borla(r) S Type Cat Back(tm) system is tuned for flow and sound on the turbo four cylinder engine of the GM 1500 trucks. This system features a 4" bright chrome on