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I fitted one of these filters to my rocker cover just to purify the cold air theory .Honestly, you'd need some very precise equipment to measure a difference in fuel use as I've noticed no change.The throttle body has stayed clean too.
I dont think your emmisions are tested from within the engine bay, are they?!
If the slight drop in 'possitive' crank case pressure -due to these breathing filters-was a problem alot of race car engines would have self destructed as a result.
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