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Usually the other way round, you buy a reverse scoop once you've fitted a FMIC not the other way round.
Going to need the map at least checking once it's fitted. But in all reality it's going to need remapping. I'd not of fitted one on it's own, the gains are minimal, should of really waited until it was needed imo
Could increase the lag though. On a 2.5 WRX with a TD04 running typically well under 1 bar boost at full power I would say its a backwards step going FMIC.