Thread: Exhaust Question
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Old 02-15-2010, 01:38 PM   #6 (permalink)
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Originally Posted by jpit View Post
Tony,

Thanks for the info. So when they say that an exhaust is 2.5", they are quoting the outside diameter.
Correct, 2.5" O.D. stands for outside diameter.

If we were referring to piping we would say 2.5" I.D. which means inside diameter...

Tony
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