M-AUTO exhaust muffler contributes to bring more air into your engine and more exhaust out, which means the higher airflow efficiency, which prevents the backpressure that occurs in a common exhaust system. As a result, the cylinders can put more power through the wheels with the very minimum restrictions and your engine will perform at its potential. Item Specification: Brand: M-AUTO Color: Chrome Item Type: Muffler Material: Stainless Steel Length: 20 in Inlet: 2-1/2 in Oulet: 3 in Package Included: 1X Muffler