Weight savings over stock: 50% Each system is hand built to order GMG direct replacement World Challenge Sport muffler set for the 996 GT3. Utilizing the same muffler design as our World Challenge cup cars to offer an amazing sound reminiscent of our World Challenge race cars. Our proprietary Muffler design offers the driver an aggressive exhaust note without annoying interior resonance or drone. Our muffler design has NO power loss and offers a weight savings of over 50% over the stock muffler set. Additionally testing has shown that our muffler design flows more air than a muffler by-pass straight pipe. Designed as a direct bolt on replacement, the muffler set will bolt up to stock tips or any aftermarket tip that mounts in a stock location. Made of Tig welded T304 stainless steel throughout including the muffler packing. Additonal features include mandrel bent tubing for optimized exhaust flow. Learn More