Brom Posted March 22, 2019 Share Posted March 22, 2019 Hi, Does anyone know the diameter of the exhaust pipe from the centre of the exhaust to the 2 x rear boxes on a Tribeca? I want to buy 2 x new free flow back boxes but i'm not sure of the exhaust diameter. Any advice appreciated.😎 Quote Link to comment Share on other sites More sharing options...
annejones101 Posted April 15, 2020 Share Posted April 15, 2020 Okay, I measured the exhaust system on our 08 with the EZ36D. These are all outside diameters measured with a caliper. Exhaust runners (headers) are 2 1/8s"Â each. Midpipe (where the system is joined) is 2" Axleback pipes are 1 1/2" each. Given that information, I think the EZ36D could really benefit from some 2.5" or even 3" piping from the catback on. I would really love to see some data on the torque curves with each size. I would also say that the headers don't seem to be a restriction even slightly. It's amazing how massive they are compared to the rest of the system. Quote Link to comment Share on other sites More sharing options...
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