Thread: MAD Downpipes Installed on G80 M3, First impressions & sounds
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      12-05-2021, 03:02 PM   #48
schumacher86
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Originally Posted by supershaft View Post
it's gonna stink like hell. i have sport cats and the smell is awful.
Did you get rid of the secondary cats as well? Or just replace the primary OE cats with high flow and keep the secondaries?
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