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Originally Posted by SaabJohan
Stainless steel containing more than 13-26% chromium will not rust given that it's treated and manufactured correctly .
AISI 409 is a cheap "stainless" steel for non critial areas. Contains only 11% chromium so it can rust. This alloy is used in cheap "stainless" exhausts.
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Amen to that... anyone who thinks stainless wont rust should take a look at my factory "stainless" exhaust after 98k miles... looks more like raisin bran