The aFe 20-21 Audi A4 L4-2.0L (t) MACH Force-Xp 3in to 2-1/2in 304 SS Axle-Back Exhaust System is designed to provide increased horsepower and torque without sacrificing sound. This exhaust system is constructed from mandrel-bent 304 stainless steel tubing for maximum durability and corrosion resistance. The system utilizes a large 3in to 2-1/2in stainless steel tubing for maximum exhaust flow and a free-flowing muffler to reduce backpressure and increase horsepower. The system is finished off with dual 4in double-walled tips for a unique look and sound. This exhaust system is easy to install and provides an aggressive, yet stylish look to your vehicle.