Thread: Evolution Racewerks Catted M3/M4/M2 Comp Downpipe
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      02-22-2020, 01:12 PM   #6
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Drives: 07-335/12-328/18-M4/21-M4CP
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Originally Posted by Conissah View Post
Oh my, those are absolutely gorgeous. Do high flow cats require a tune, or can the stock ECU account for them? Seems that the stock stuff is pretty good at adjusting.
You can run these downpipes on a stock tune
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