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Tail Pipe Modifications - What Grade of Stainless?

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Old 10-05-2018 | 06:34 AM
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Default Tail Pipe Modifications - What Grade of Stainless?

I need to modify my existing tail pipes and would like input on material. Obviously stainless steel, 316L is more corrosion resistant 304 (18-8), is there much difference / benefit between the two in this application? is there an alternative grade that should be considered? This will be a completely dry set up. that will consist of half of the original pipe and the other half will be new material.

Also will welded seem tubing work?

Last edited by ezrizer; 10-05-2018 at 07:15 AM.
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Old 10-10-2018 | 06:03 PM
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I used this for 12" extension for my CMI E-Tops. My exhaust is wet though.
https://www.ebay.com/itm/4-102mm-16-...skYt:rk:1:pf:0
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Old 10-11-2018 | 07:05 PM
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Good question, this is my take on it and what I have experienced first hand. 316 will give you the best all around resistance to corrosion no arguing with that.
Ive been making my own tubular risers for around 5 year now with different cams and using anti reversion chambers to eliminate reversion.
As these riser where for test only I used 304 as it was cheaper, over the last five years I have used the same riser on one engine which has had salt water runs but lives in a brackish water lake. I had a look inside the water jacket this year and they are discoloured but NOT corroded at all. The outside of the riser look as good as the day I made them.
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Old 10-13-2018 | 05:49 AM
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Thanks for the replies. CMI says there headers are 316L but tail pipes are 304L. We didn’t discuss seamless or not. 304L in 4” is pretty easy to find, 4-1/2” is harder to find.
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