This exhaust system is constructed of mandrel-bent brushed finished 304 stainless steel tubing for maximum strength and durability. The 2 IN loop pipe replaces the factory side mufflers, and incorporates a loop design for better sound. The muffler bypass is constructed of 2-1/2 IN tubing. This system produces an aggressive sound unleashing all available horsepower and torque. Utilizing factory style flanges this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation. This system incorporates factory style pneumatic exhaust valves. The valves open the 2-1/2* Muffler bypass tube or direct the flow through the 2 IN loop pipe that replaces the factory side mufflers. State-of-the-art computer-aided design technology is utilized for precise vehicle fitment. 100% TIG-Welded for race-proven strength and durability. MACH Force-Xp 304 Stainless Steel Primary Muffler Delete Pipe Porsche 911 GT3 14-19 H6-3.8/4.0L Porsche 911 GT3 14-19 H6-3.8/4.0L