This is barely used, Flowmaster 80 Series Cross-flow muffler. I installed this on my 68 Firebird for the engine break in only, then decided to go a different route for the exhaust. This is like brand new and only has 1 to 2 hours of run time. This is the perfect muffler for the lowered first generation Camaro or Firebird when ground clearance is an issue. This muffler fits between the differential and gas tank. UPC:700042016891 Case Shape:Oval Inlet Diameter (in):2.500 in. Inlet Quantity:Two Inlet Location:Offset Outlet Diameter (in):2.500 in. Outlet Quantity:Two Outlet Location:Offset Internal Construction:Chambered Muffler Material:Steel Muffler Finish:Aluminized Case Length (in):22.000 in. Overall Length (in):28.000 in. Thickness (in):4.000 in. Width (in):9.750 in. Outlet Style:Standard, without tip