The MagnaFlow 2010-2016 Audi S4 Touring Series Cat-Back Performance Exhaust System is the perfect partner for your 3.0L 2010-2016 Audi S4 to take on a grand tour or a weekend cruise thanks to the powerful resonant exhaust note and dyno-proven performance it brings to the table. This durable corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing mandrel bent 2.25in. main piping and 3 Straight-Through muffler that terminate in a Quad Split Rear exit with 3.5in. Polished Welded-On Double Wall Angle Cut Folded Edge tips. 15599 features a cat-back layout design to replace your import's stock exhaust components from the catalytic converter on back. This Audi S4 exhaust system is compatible with 2010-2016 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install direct-fit design that fits your Audi S4 like a glove. 15599 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow's limited lifetime construction warranty.