Quote:
Originally Posted by OB0001
Tips are 304, rest of Exhaust is 409S
Most modern factory exhaust systems are made from 409 stainless steel. It is strong and will last 8-10 years in a moderate climate. 409 stainless steel will rust on the surface. However, this is not a concern for most people because it is hidden under the vehicle. Surface rust can be cleaned with a wire brush.
304 stainless is the highest quality material used for exhaust parts. It will last 10 years or more in a moderate climate. However, it is the most expensive. It will not rust for many years. But, it will turn a golden brown color after being exposed to heat.
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This post is why I come to the forums.