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. System features Borla's aggressive ATAK muffler and Polyphonic Harmonizer Technology which utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound. Replace the Polyphonic Harmonizer behind the muffler in the ATAK system wit h muffler 60679 to attain the in.S-Type in. sound level (quieter than ATAK). 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.