Factory Single Side Exit vehicles ONLY. Add Adapter 60708 For Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles. This 3" Borla(r) 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 4" bright chrome on T-304 stainless steel tip. A black chrome on T-304 stainless steel tip is also available. Borla(r) Cat-Back(tm) & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive Borla(r) Sound of Power respected by motoring enthusiasts everywhere. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. The system is constructed using premium, high quality T-304 stainless steel which is superior to 400 series and is backed by the Borla(r) Million Mile Warranty.