FYI, the ABYC Exhaust Systems Standards, Article P-1 found in the Standards category on this forum is specific about hot (dry) section materials.
Section 1.6.3 found on the 4th page of the pdf (numbered page 2):
Quote:
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1.6.3 Pipe Size - Threaded pipe and fittings for the engine exhaust(s) should be at least schedule 80 pipe or equivalent.
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In support of Edward's comment please note that the quote is specific to
threaded pipe and fittings. Taking a position of what they didn't say is just as important as what they did, formed and/or welded systems (not threaded) would not fall under the schedule 80 requirement.