Is it not true that some of those evac systems actually cause pressure at low RPM's instead of vacuum?
I read that somewhere on a hotrod website so it must be true.:D
So maybe if it's a daily or weekend around towner it would best be served by a standard PCV system, no?
The one way valves at the headers will stop any pressure. I measured mine at idle and it pulls about 2 inches of vacuum. That's with a full exhaust system
