I put a supercharger on my car and all I did was cap off the throttle body and put a breather on the valve cover. Summit also makes a crankcase evacuation kit for around $40. Basically you run breathers from the valve covers to the hedders where a tube is welded in. The exhaust gases creates a venturi and sucks out pressure through the valve covers. This is usually only done on race cars. I put one on a 60's stang and it worked well. I doubt it's smog legal though.
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