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So when a piston goes up your negative pressure would be bad so whats the gain?
Also like i said the whole reason for it is to keep hot and oiled air out of the intake system since it can create detonation. (oil in ic and oil on your MAF isnt good either)
The oil that shoots out of the valve cover from excessive pressure (kicked up from cams and such) is caught by the can and the filter is large thus letting any positive air move through the filter. Id use another vac source like i said in the last post. The only reason the factory setup goes into the intake is for emissions and its legal.
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