... ,4 .Material: stainless steelRated volume: 5.9L/6.000lbsTWCat026inlet/outlet : 1.75", 2" ,2.25", 2.5", 2.75, " 3"· ... range of gasoline catalytic converters· 5 yeasr warranty on converter body· sell meterial 409 and 304 ss· Inside the catalytic converter ,this is ... a metal or ceramic honeycombed substrate ,on the surface of the substrate .coated with the ...