(5" x 9" x 15" Long 3-1/2" Inlet - 3-1/2" Outlet) Vibrant's "True Straight Through" perforated internals for unrestricted flow and maximum horsepower. These mufflers are densely packed with premium multi-layered sound absorption materials, helping produce a low, deep exhaust tone. These mufflers are 100% T304 Stainless Steel Construction with a high temperature Flat Black coating to help avoid unwanted attention.