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I don't know about the Gruppe M, but an aftermarket air filter is necessary if you have a catless exhaust - I can finally hear that beautiful intake again at WOT!
In fact, with its bang for the buck, everyone should have one.
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'09 E93 M3, AW, M-DCT, Fully Loaded
Bunch of mods, why such limited signature space M3post   ?
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