I've not had any MAF issues with the Apexi.
The main killer of the MAF when fitting an induction kit is vibration so the MAF/Filter needs to be supported.
You can get good gains if you are already around the 300bhp mark but you will need it remapped. Saying that though my classic on the apexi ecu and apexi filter needef only very little map changes only really for performance than safety/fuelling. But the Hawk STi needed quite a bit of MAF rescaling to stop it running dangerously lean when fitting an RCM sized K&N.
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