GT Spec Mufflers are Apex's flagship line of exhaust systems. These race-bred exhaust systems were engineered to handle extremely high-horsepower applications. A'PEX is the only company in Japan to own and operate a 95mm (3.74 inch) mandrel pipe bender at this time. They proudly incorporate this 95mm piping on select applications to offer exhaust systems unmatched by any other manufacturer. Pipes for the GT Series are designed with minimal amount of bends and the canisters project at an angle like the N-1. The GT Series pipes and canisters are constructed of polished SUS 304 stainless steel. The 115mm polished tip give the GT Spec Mufflers an aggressive, yet refined style. GT Spec Mufflers include the Super Silencer, which can reduce noise levels by up to 7 decibels. Piping Diameter: 74.7mm-85mm Tip Diameter: 115mm