... produced from the 304, 316,321,310 and 310 stainless steel. High nickel Stainless steel auto muffler mat Gold standard type of front ... of catalytic converters, usually produced from the 304, 316,321,310 and 310 stainless steel. High nickel content alloys, such as Inconel ... the converter unit located near the engine manifold. Stainless steel auto muffler mat