Stainless Steel Round Exhaust Muffler+Silencer - 3" Inlet 4.5" Tip (Black Coated) Improves Exhaust Velocity Performance. Offers Great Air Flow and Higher Horsepower Gain Instantly Increases 5 - 10 HPs for Most Vehicles Inner Inlet Diameter - 3" / Tip Diameter - 4.5" Overall Dimensions - 20.5"L x 5"W x 5"H Canister Dimensions - 14"L x 5"W x 5"H