Who knows, an open filter with no airbox may make less power, until you test it we won't find out, I was very surprised at the outcome of the ITG, hence why I am keen to boast of its results, had I got a Ktec one and it did the same I would do the same, but we wait to see if it makes or looses power. A lot can be down to the air flow into the filter. I modified my ITG the other week, but soon removed it as the car felt flat.
Nothing changed apart from I welded a 100mm pipe on the side to draw air from the slam panel and blocked the original inlet pipe off, to see if drawing cold air from outside the engine bay would be better. Epic Fail
Back to this now
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