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Mission Performance just put down a safe and conservative 440 WHP with a stock box and filter - if you want more noise go for it but for meaningful power gains probably not so much (opinions vary this is just mine)
Ps- MP almost exclusively runs factory intake and filter because Alex doesn't want to introduce particulates into the engine and he builds BMWs with crazy power and tracks and drags them on a regular basis - just food for thought
Motor on :-) and do whatever you want to your BMW because....well it's yours :-)
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