header mounted crankcase evacuation

[jwboner]

I was thinking about the backpressure. I don't know what muffler if any that doesn't make too much backpressure that enable to use the kit. I am using 2.5" Delta flow Flowmasters. If I were to use the header mount kit I would put a check valve to keep exhaust from going back up the tube, but if there isn't ever enough vacuum to suck the air out the pipes the whole thing will do nothing as long as the mufflers are making backpressure? What else would clear out crankcase vapors like that without going to a belt-driven vacuum pump? Thanks for the info guys.