I got a chance to test my custom valved exhaust made by Garage Auto Sports in Newmarket Ontario for my 2008 Audi R8 V8. This is a valved stainless steel exhaust system that really opens up the breathing of this high revving V8 engine, creating an exotic F1 sound and pitch and allowing for much more performance through airflow improvements and the opportunity for a tune in the future. To say I am happy is an understatement, I could not have imagined how much it would transform the car, and really happy to get the rear buttoned-up together and hear it on the roads. The old exhaust was double the weight of this new custom one as well.