FlowMaxx Valved Side Muffler Bypass Pipes for Porsche 991.1 / 991.2 GT3 / GT3 RS models are equipped with valves offers the capability to produce an aggressive exhaust note under acceleration, and a more quiet tone for city driving. When cruising on the streets the valves are closed and produce a deeper exhaust tone. At wide-open throttle the valves will open, producing a unique rich exhaust tone. Exhaust valves are controlled by the engine control unit and works exactly like how the original exhaust system would of functioned on the vehicle.
