Borla(r) system is a True Dual design. This 3" diameter Mid-Section includes Active Exhaust Valves. The ATAK(r) sound level delivers an aggressive race-bred sound without any drone. It features our Polyphonic Harmonizer and SwitchFire(r) technology. Borla(r)'s Polyphonic Harmonizer Technology 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. Completely eliminating the turbulent center intersection of a standard X-Pipe Borla(r)'s patented SwitchFire(r) design truly blends the combustion pulses from both sides of the engine for improved performance and a custom sound. It fits with either Borla(r) 60727BC black chrome on T-304 stainless steel 60727CB brawler style black coated T-304 stainless steel 60727CFBA carbon fiber with black anodized center or the Original Equipment (O.E.) tail pipes. The system is constructed using 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. Best of all it is backed by our Million Mile Warranty., Million Mile Warranty, System Features:, Cat-Back(tm) Exhaust System, System is a True Dual design, ATAK(r) Sound LeveL, SwitchFire(r) Technology, Contains Polyphonic Harmonizer technology, Includes Active Exhaust Valves, T-304 Stainless Steel Construction