If I was gonna get catch can I'd put on a breather filter it's like a white mesh inside anyway to prevent that from happening. So some oil actually gets caught on
MILVs are valvetronic shims. They basically increase valve lift when valvetronic is set to the highest opening position. You can look up bimmer MILVs online and see the website aswell as a few threads going on about their benefits. Developed by cobramarty. If you can afford it do them with the cover off already.
Not tagging the actual URL because I think the guy that makes them got banned from here for selling them without paying the forums to do so
