Vibrant Performance StreetPower Universal performance mufflers feature T304 stainless steel construction and True Straight Through perforated internals for unrestricted flow and maximum horsepower. StreetPower Universal mufflers produce that low, deep exhaust tone you crave! This great sound is achieved due to these mufflers being densely packed with premium, multi-layered sound absorption materials. Exhaust tips and inlet necks are TIG-welded for excellent weld durability. Give your street machine the ultimate in performance and sound with Vibrant Performance StreetPower Universal performance mufflers!