Street Performance's 7" Round Body 4" In X 4" Out and 5" In X 5" Out Street Max Muffler offers a rich performance tone minus the bothersome interior drone or piercing external sound frequencies (rasp). Its innovative design includes a high-heat thermal mesh, ensuring exceptional sound control while preventing blowouts. The straight-through core design optimizes flow, enhancing horsepower and torque. Crafted from robust 16-gauge 409-grade stainless steel, this exhaust system guarantees superior strength and durability.