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2.5" ID, 4" flange.
Watch out for some of the no-names on ebay. They have a 2.5" ID but the Bolt holes are less than 3" apart. So if you use a 3" Test pipe on some of them you'll get a leak. Using a 2.5" gasket fixes the problem. Have not seen this problem on the OBX brand. Only on the no-name ones.
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Comments should be taken as Opinions not as Statements of Fact 
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