997VALVETRON-SP Spyder Performance Valvetronic Exhaust Silencers complete with fitting kit. These silencers are switchable (via a wireless remote fob) giving your 911 a beautiful sports sound at the press of a button and the ability to return the exhaust note to stock when required. The silencers also provide the added benefit of a performance gain, giving increases of up to 17bhp & 19ft-lbs of torque at the wheels when the valves are open and up to 10bhp & 8ft-lbs at the wheels when closed. Manufactured from high quality stainless steel. Included with the system is a fitting kit, which you will need to connect the mufflers to the engine vacuum system as well as the electrics in order for the valves to function correctly. Fitting instructions included.
