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**JET** · 05-09-2005

I will look into it some, but strength might be an issue.

Stock manifolds are cast iron for a 1g, 2g's have a better formulation. Not all SS is good for exhaust manifolds. The best by far is 321 stainless (when money is an object). It uses titanium to stabilize it in the medium temperature ranges. Basically all other stainless will start to break down when used in the 800* - 1550* range. Notice that this is right in the normal operating range for an exahust manifold. In that range most SS will form a chromium carbide precipitation that comes to the surface. This brings the carbon out of the SS and makes it weaker at higher temps.

In closing, only 321 stainless or inconel should be used on a exhaust manifold for a daily driven car. On a race car that doesn't see a ton of use, you can get by with 304.

05-09-2005	#38
JET Is funding Exxon. Join Date: Oct 2003 Location: Ham Lake Drives: like a bat outta hell! Posts: 7,983	Re: Product ideas I will look into it some, but strength might be an issue. Stock manifolds are cast iron for a 1g, 2g's have a better formulation. Not all SS is good for exhaust manifolds. The best by far is 321 stainless (when money is an object). It uses titanium to stabilize it in the medium temperature ranges. Basically all other stainless will start to break down when used in the 800* - 1550* range. Notice that this is right in the normal operating range for an exahust manifold. In that range most SS will form a chromium carbide precipitation that comes to the surface. This brings the carbon out of the SS and makes it weaker at higher temps. In closing, only 321 stainless or inconel should be used on a exhaust manifold for a daily driven car. On a race car that doesn't see a ton of use, you can get by with 304. __________________ Is burning corn and stayin' warm! My motorcycle is stock and reliable, my Talon is neither!