Stainless Steel Twin Loop Exhaust Muffler - 2.5" Inlet 4" Slanted Tip Improves Exhaust Velocity Performance. Offers Great Air Flow and Higher Horsepower Gain Instantly Increases 5 - 10 HPs for Most Vehicles Aggressive Deep Discharge Sound Inner Inlet Diameter - 2.5" / Tip Diameter - 4" Overall Dimensions - 26"L x 8"W x 7"H