egr makes your intake dirty, show me clean exhaust pipe, the by products that come out of your exhaust eat up your valves and seals, it makes your engine run so much cleaner, i understand its to get the left overs and burn it, but at the cost of wear? and the pcv vent, scavenge that off into your exhaust, the fumes that come from that can gunk an egines intake, engines are living organisms, they need clean air too, sorry, its a pet peev