but without a crankcase vent (ie that one way valve) when its under vacume your sucking air is past all your crankcase seals (can make for some sweet noises of all types)
sc cars can keep the entire stock pcv system with just an external metered fresh air supply if an IC is in the way
hell you can plumb a damn oil seperator into the oem sc case PCV pathway and get rid of alot of that detonation causing oil!
i have pics in one of my many photobuckets...
but no you dont need two breathers, the rear would be more likely to discharge oil mist...on hot exhaust. run a hose from the two oem fill caps to a separate breather tank with a vent and remove the pcv system. even better tap into the oem pcv paths where it allows for far more oil to fall out of suspension inside the engine before it goes tot he tank. (you dont need to drain it nearly as often...the rockers and springs stir up that oil into quite a tizzy....)
