2.50" Inlet 4.00 Diameter" X 2.50" Outlet 11.00" Long WRM40009-250-SS Stainless Steel Exhaust Muffler Resonator 2.50" Inlet 2.50" Outlet 4.00 Diameter" X 11.00" Long Over all Length 4.00 Inch Diameter Body 9.00 Long Stainless Steel Highly Polished Resonator Muffler Resonator Muffler Fits a 2.50 Inch Exhaust Pipe 2.50 Inlet 2.50 Outlet