Im wondering if the wrong grade stainless was used. It seams that most over-the counter stainless is the 304 grade.
Anybody use the 321, 347 or the specific 409 grade for exhaust.
I was just looking at the stainless grade chart and the 321,347 is a stabilised grade for heavy section welding and high temperatures.
Then I saw that the stainless grade 409 is listed as automotive exhaust grade that is weld stabilised.
I was thinking of building a light weight stainless exhaust similar to an airplane, but now I maybe second quesing that idea based on what Im seeing here.
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