The new GMG World Challenge Sport Muffler Set center section utilizes our race proven cross over center section with proprietary dual core mufflers and a megaphone design which improves the sound and speeds up the exhaust velocity as the exhaust exits the catalyst. (patent pending design) Made entirely of T304 stainless steel that is handcrafted at our facility. The entire system utilizes mandrel bent tubing, in addition the mufflers are hand built and utilize stainless steel packing throughout. The system is purge Tig welded by hand and all welds are normalized to prevent cracking. Each system features a GMG exclusive brushed finish. As with the World Challenge GT system for the 997.1 Turbo the WC-GT 997.2 Turbo system produces a refined sound reminiscent of the Carrera GT and without drone.