Factory Split Rear Exit ONLY. This system features bright chrome on T-304 stainless steel tips. Add Adapter 60706 for Crew Cab with Standard Bed (6' 7 in.) 157 in. Wheelbase vehicles. Replace the small muffler behind the primary muffler in the Borla in.S-Type in. system with Polyphonic Harmonizer 60680 to attain the in.ATAK in. sound level (louder than in.S-Type in.). Optional in.True Dual in. Cat-Back system available, see the Related Parts section. Borla Cat-Back & 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 Sound of Power respected by motoring enthusiasts everywhere. Each system is built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit.