2006 330XI

you already have the 330 with the upgraded 3 stage intake.

Power wise there is not much you can do . The best mod would be ESS supercharger ( 5000 $) and it will bring you up to 300 whp ( more or less)

You could also add headers , AA headers are around 800 plus AA off road tune at 500 $ would give you another 18-25 whp

K and N filter with charcoal delete may give you 2-3 WHP but it will improve sound and responsiveness

Catback exhaust will give you a nice sound , but again it won't do much improvement power wise.

AA tune by itself is around 500 $ and it will give you a 5-8 whp bump but it will get rid of the lag

Not many options but there are some

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2006 330XI