Crankcase vent know how

Anybody familar with the pan evac systems?I ended up ordering a Tti 3 inch exhaust for my duster since no shops around here could do a mandrel one.Also ordered a summit evac system.But now ive been reading you cant run them with mufflers?Any truth to that,and what are some of you running for evac systems besides expensive pumps?Thanks all.
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