RENNtech muffler bypass exhaust system is the answer to the inherently quiet factory and aftermarket exhaust systems currently on the market for the 997.2 3.8L Turbo /Turbo S. The variable turbocharger itself acts like a muffler and when coupled with even a cat bypass sport muffler, is still fairly reserved and quiet.
RENNtech muffler bypass exhaust removes the bulky factory exhaust system (saving nearly 40 lbs of weight behind the rear axle) and utilizes 200 cell HJS tri-metal sport catalytics with center muffler bypass pipes. The result is a dramatic reduction in rear vehicle weight which produces and intoxicating sound both at idle and wide open throttle, with no drone or resonance in the cabin, even at highway cruising speeds in top gear. Since this system utilizes 200 cell sport cats and retains both pre and post catalytic oxygen sensors, this is a bolt on exhaust system which is emissions compliant and does not require an ECU upgrade. Our system reuses the factory tips or any other aftermarket tip designed to work with the OEM system.