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      04-23-2013, 10:32 AM   #2
roundel335
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Drives: 13 335i Sedan, 16 228i Cabrio
Join Date: Apr 2010
Location: Leland, NC

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I'd say it will depend on your dealer. The dealers I've worked with generally will not make a fuss about an aftermarket exhaust or intake, for instance - but not all are the same way. Best advice is talk to your SA about it.

That said, I have the MPE (port-installed) and it sounds great. Cat-back on an N55 (single pipe) probably won't do much better, and you run the risk of "highway drone", which can be very annoying.
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2013 F30 335i M-Sport 8AT/MPE/MPPK, 2016 228i M-Sport Cabrio 8AT