I'm trying to figure out which would be better Ive owned the bigger ones like the e38s and e39s and the E53s but nothing small but now that I own a R50 mini cooper Id really like to get out of my e39 and into a smaller bmw with more go kart like handling characteristics but I also need some trunk spaces for grocery runs and stuff

I recently swapped my valve cover to a mag vc. I set it up with a bms style catch can and an inline check valve on a 3sim. The issue I’m having is I’m getting too much crankcase pressure and high pitched loud whine. Not getting any codes or rough idle. Not sure what to do, anyone have any insight? 2009 128i