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I have emissions coming up eventually so I need a cat again, so I just decided to go with the rx7.com high flow cat/midpipe. And I switched my catback to the HKS single to drop some weight versus a dual can catback.
By the way, I don't do dibs. First to pay gets it. I have too many bad experiences over the years of selling rx7 parts where people yell "dibs" and then don't pay.
It is 3", info in the link provided. It does however mate up to the stock exhaust manifold off the engine, so of course it isn't 3" at that point, but in that aspect no midpipe for the rx8 would be a true 3" unless custom made with a different exhaust manifold/downpipe.