If your only racing, WOT is the only thing a race engine sees. The basic valve cover to collector evac is excellent. The issue comes up when you stray from the track and go for a cruise on regular civilian roads. Even if for a couple of miles , the evac then isn't working at 100% between idle and WOT. that is where the mech pump's all time presence helps from fouling sparkplugs and causes gaskets to weaken and leak. I am really interested in hearing if anyone runs an electric version. I will message the guy on RJ that is selling them to see if he will give us some feedback.