The Akrapovi? Slip-On system is based on the same layout as the original exhaust system of the GT3 with valve control. The Slip-On contains a titanium muffler with two double round tailpipes. The muffler is easily installed on the original exhaust system. The 911 GT3 equipped with an Akrapovi? Slip-On exhaust system is more powerful and lighter, even though the exhaust system is not replaced entirely. The sound of its six-valve engine is also noticeably improved. A look at the numbers reveals that the Slip-On offers weight reduction in the rear of the Porsche and an increase in power. Two tailpipes, 100 mm in diameter, make it clear that the Akrapovi? Slip-On system is no ordinary exhaust.