This 3" diameter with 2.25" diameter tail pipes Borla(r) Cat-Back(tm) system is intended for vehicles with significant performance upgrades. It contains a merge X-Pipe for increased performance and improved sound. The system delivers the aggressive ATAK(r) sound with no drone inside the vehicle. Each muffler assembly has dual 4" round polished T-304 stainless steel tips. A system with carbon fiber tips is also available. The system will fit vehicles with Dual Mode Exhaust (NPP), but it does NOT include Dual Mode or AFM valves. On vehicles with AFM a check engine light will be activated. It may be used with the dual tip lower bumper cover to convert a single, split rear exit to a dual split rear exit. Borla(r) Cat-Back(tm) & Axle-Back exhaust systems feature patented straight-through and multi-core technology 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 T-304 austenitic 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, Borla(r) stands behind every system with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.