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When I purchased my 335i it had the mpe and mppk. The exhaust was annoyingly loud on cold starts so I put it back to stock exhaust and gained a bit of torque in the low end. If I lived out in the country I would have kept the exhaust. From what I have read unless your car is M-sport they will not install the mppk. The advantage of the mppk is the added cooling keeps the temps way down. I think a perfect combo would be the parts for the mppk, upgraded fmic and a Cobb off the shelf tune if you are worried about the warentee.
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2009 118i Monaco Blue "Maximillion"
2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit.
2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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