Factory Single Side Exit vehicles ONLY. Add Adapter 60708 for Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles. The 3" diameter Borla(r) Cat-Back(tm) system is a side exit system featuring the mellow Touring sound level with no drone inside the vehicle, and a 4" round bright chrome on T-304 stainless steel tip. A system with black chrome on T-304 stainless steel tip is also available. Borla(r) Cat-Back(tm) and Axle-Back exhaust systems feature patented straight-through and multi-core technology designed 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. Each system is built from premium, high-quality T-304 austenitic stainless steel, superior to T-400 to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision CNC manufacturing ensures an accurate fit. Give your Silverado or Sierra the power and sound it deserves, bolt on a Borla(r). You can count on Borla(r) to provide durability, performance, sound, and a Million-Mile Warranty.