Factory Single Side Exit vehicles ONLY. Add Adapter 60708 for Crew Cab with Standard Bed (6' 7) 157 Wheelbase vehicles. The 140793 Cat - Back(tm) system by BORLA(r) is a side exit system featuring the mellow Touring sound level and a 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) 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. You can count on BORLA(r) to provide durability, performance, sound, and a Million - Mile Warranty.