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409 Stainless Steel vs 304 Stainless Steel So you are setting out to build a stainless steel exhaust system. But what material do you choose? 409 and 304 stainless steel are the two most popular choices in the exhaust / muffler industry. So we are going to try and explain both of these metals in a way that everyone can understand. 409 Stainless Steel:  409 stainless steel is widely used in the automotive industry. This material has been used for quite some time on factory exhaust systems and catalytic converters. It is a ferritic metal alloy with 10.5 to 11.5...