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.