Originally Posted by Leighton 
It is my track car, but i use it on the motorway (freeway) to get there... would it be no good if i got stuck in traffic??
What effect will it have?
Again .... Your PCV valve works at idle ... so the filter will not affect it at idle ... where the issue with the filter is is at hard acceleration ..that hose going from the intake to the valvecover helps suck the vapors out at high RPM , so basically you loose power at hard acceleration / high RPM when you bypass with a filter ...
Blowby is just the vapors that slip by the rings into the crankcase, those vapors can build up and the pressure will hurt your power ... PCV sucks out the pressure at idle and low RPM , but does little at high RPM ...the hose is what sucks it at high RPM ...
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