This 3" diameter True Dual Quad Tip Borla(r) Cat-Back(tm) system features a merge X-Pipe for increased performance and improved sound. Muffler contains 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. This system features the aggressive ATAK(r) sound with no drone inside the vehicle and 4" carbon fiber tips and is for vehicles without the Active Exhaust feature. Systems with bright chrome on T-304 stainless steel tips and black chrome on T-304 stainless steel tips are also available. If your car has 1 tip on each muffler and you want to upgrade it to 2 tips on each muffler (also know as quad tips) this is the system for you. It is designed to work with the quad tip (2 tips per muffler) O.E. Ford Valance ONLY. W/ Parking Sensors: PR3Z-17F828-DA. W/O Parking Sensors: PR3Z-17F828-CA. Borla(r) Cat-Back(tm) and 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(r) 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. 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.