E46 M3 was naturally aspirated. On the 1 M with twin turbo chargers, these modification have a much stronger effect, as the intake and intercooler allow the turbos the spool quicker, and have better flow which then relates to increased horsepower. I currently am not to satisfied with everything on the market yet, however I know the AFE for example has shown great gains. As far as intercoolers I really think the Evolution Racewerks is the best of the best for the N54 Motors.
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