DNA MFL-OV-A-RL-3-4 - Stainless Steel 4" Slanted Tip Exhaust Oval Muffler (Set of 2) 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" Overall Dimensions - 24"L x 7.75"W x 5"H Canister Dimensions - 14"L x 7.75"W x 5"H