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I predict: stock CAI (which is already a closed cold air-intake system, only with a panel filter, in stead of two cones lol) performs better than this aftermarket setup. Only Gruppe M for me looks like an alternative, but again, that's very close to stock and it will perform as good as stock (at it's best). Only replacing the panelfilter by conefilters, does not give a seriously powergain. By the way, CAI's on a turbo engine like BMWN54 are in a way useless.
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