The APR Exhaust X-Pipe - 4.0 TFSI - C7 is a performance exhaust system designed to maximize power, torque and sound on the Audi C7 platforms with 4.0L TFSI engines. This X-Pipe features a unique design that eliminates the factory resonator and provides unrestricted flow. It is constructed using high quality T304 stainless steel, mandrel-bent tubing and CNC machined flanges for maximum durability. The X-Pipe also has a distinct performance sound that will enhance the driving experience.