Valvetronic Design Audi MK4 RS3 Valved Sport Exhaust SystemThe Ultimate Soundtrack for Your RS3 Audis 8Y RS3 is the pinnacle of modern compact performancean all wheel drive, turbocharged five cylinder beast that punches far beyond its weight class. But no great performance car is complete without an exhaust that matches its character, aggression, and soul. Thats where we come in. At Valvetronic Designs, we have engineered an exhaust system that doesnt just enhance your driving experienceit transforms it.