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Old 10-13-2011, 01:35 AM
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Question Stock exhaust diameter/size

I know I have seen this topic on a couple of other threads but I don't have a definitive answer yet. I am just wondering what is the stock diameter size of my 2004 Mazda 3 s. I am looking to do an axle-back muffler replacement and hoping that I can find some that will be a better fit. Any insight will help, thanks!
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Old 05-17-2016, 07:21 PM
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IIRC the stock is 2.5 inch. Mazdaspeed is 3 inch. I had a mazdaspeed exhaust put on my 2006 mazda3 hatch and its pretty dang loud.
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Old 05-17-2016, 07:34 PM
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actually it looks a little smaller than that
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Old 11-22-2017, 02:08 PM
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Thank you! Does anybody have details and specs for the '10 CX 9 (3.7 litre) stock exhaust pipes? I need to replace my mufflers (again) and a looking to downgrade to a more stock-like option. I have a muffler shop to weld, etc, but I need to match the inlet diameter to the resonator-back pipe.

Thanks mucho!
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