Fabspeed Audi R8 4.2L V8 Supersport X-Pipe Exhaust System incorporates a resonated x-pipe design that replaces the heavy and restrictive factory rear muffler for significant weight savings and an improvement in sound, throttle response, and power. Fabspeed believes each supercar deserves an ultimate lightweight "aerospace grade" stainless steel exhaust for the best performance and exhaust sound upgrades, not just a heavy and factory like exhaust system. Fabspeed spent hundreds of hours on development and sound tuning to produce the perfect exhaust that provides a unique and aggressive sound with an overall improvement in power. Another great benefit of the Supersport X-Pipe system is that it's much lighter than the factory exhaust, saving over 40 pounds of dead weight from the rear of the car. This is achieved by improving the overall design and streamlining the exhaust path for maximum flow throughout the entire system which eliminates the use of restrictive large mufflers and added exhaust tubing for an overall unmatched piece of performance engineering.