Header piping size. ID or UD?

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Oct 1, 2009 | 07:43 AM

Mar10n

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Header piping size. ID or UD?

When people say like 1 3/4 or 1 7/8 header size. Is that the inside or outside diameter?
ID sounds most reasonable, because the inside dia will depend on wall thickness if it was UD. Just want to be sure before i order som tubing..

Thanks

Oct 1, 2009 | 12:49 PM

ramairJP

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From: Raleigh, NC

The tubing size is the OD

Oct 2, 2009 | 01:53 AM

Mar10n

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hmm seems a bit strange to me. is there one standard wall thickness thats used then?
if not, then there could be different ID on the headers..

Oct 2, 2009 | 10:44 AM

TooLateVTEC

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From: FredVegas, Va

I think some companies use ID and some use OD.

I just went to Hookers website and they use OD, but ive seen the ads on ebay for the knockoff brand headers and theres pictures of someone measuring the ID being 1-3/4".

There isnt one thickness of material used on them either.

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