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jmd?? jdm or japanese domestic market. they are the same size except for the collector on the type r model at 2.5" vs.2.25" for the others in b series models
^^yeah JDM... i measure the collector is 2.5"... is it longer than the U.S version?
Its got a bigger diameter, yes. It won't bolt right up to the stock cat. You'll need to weld a 2.5" flange onto your cat if you want to keep your stock piping, or go with a 2.5" exhaust setup.