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There certainly are alot more contributing factors, I once took my ST mondeo to a rolling with a performance cone filter on and was down on power, rolling road guy told me to put original airbox back on with a decent filter which I actually still had in the boot of my car, I put it on and went back on the rolling road and performance went up. So yes a performance filter can have the opposite effect.
One key factor with the more air statement is "cold air"
I watch alot and I mean a lot of American mod programs and I cringe every time I see a beautifully modified car with a cone filter added into the engine bay sucking in lots of hot air
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