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Originally Posted by M3_Dust
that's not true at all, BMW spends billions engineering every aspect of their cars and especially the engines, in many cases with their newer cars, there is no superior aftermarket intake and some will even lose you power, especially on the E46 M3. Your best bet is to improve the efficiency of the stock system, just do a less restrictive replacement panel filter.
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Generally factory intakes are pretty good, and the N54 is not an exception, but there is big power to be made with aftermarket intakes. Especially once you tune the car and raise the boost level.