Quote:
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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I'm tired of K&N oil and will use oem paper filters. I think you would be surprised at how well many oem paper filters flow, assuming they're clean.