I can't say for sure, but you can bet it will be minimal. Almost certainly not enough to make a noticeable difference while driving.
To get something noticeable, I would bet you would have to do CAI + freer-flowing exhaust... and I'm not even sure that would do much.
Maybe a little ECU tuning could help too. People with more experience on this can likely give you a more definitive answer.
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Current: 2007 335i sedan
Alpine White | Sports | Premium | Cold | Comfort Access
FORMERLY: 128i coupe
Alpine White | Sports Package | Black Leather
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