The MagnaFlow 2009-2016 Audi A4 Quattro Sport Series Cat-Back Performance Exhaust System 15519 enhances your 2.0L 2009-2016 Audi A4 Quattro with an aggressive character that is sure to help you stand out from the other Audi A4 Quattro you encounter on the street. With its 3in. diameter fast-flowing mandrel bent main piping that passes through 2 Straight-Through mufflers before ending in a Dual Straight Driver Side Rear exit with 3.5in. Polished Welded-On Double Wall Angle Cut Folded Edge tips, this dyno-proven Audi A4 Quattro exhaust system refuses to be ignored. As such, 15519 is tuned to produce our powerful, resonant signature exhaust note at Aggressive exterior and Moderate interior sound levels, so please check to ensure compliance with local noise regulations. The system's cat-back design replaces all your import's stock exhaust components from the catalytic converter on back. Extensive 3D scanning and CNC precision robotic manufacturing techniques are used to ensure that your exhaust system fits perfectly with just a simple do-it-yourself installation process. The durable, corrosion resistant stainless steel construction of 15519 is backed by MagnaFlow's limited lifetime warranty.