What's this hose ?
 

I've only seen this hose on n18s and even then not everyone I've seen has it , You by chance know what this hose goes to and if it can be plugged or does ot gotta be plumbed onto the intake ?
I'm wondering if I can just plug the line or if I need to plumb it into my intake because I don't want a cel or cause an issue..
Any help is always a big help .
https://cimg9.ibsrv.net/gimg/www.nor...313bc1211c.jpg

https://cimg3.ibsrv.net/gimg/www.nor...5972369a74.jpg

That hose is part of the crankcase ventilation system. It goes down to a port below the intake manifold. You won't gain anything by deleting it.

Here:
https://www.realoem.com/bmw/enUS/sho...diagId=11_4587

https://cimg2.ibsrv.net/gimg/www.nor...47f1e806fb.png

Well I will leave it the way it is because I don't want excessive crankcase pressure, especially since im running a big turbo. I will just install a boost tap into my intake hose inorder to retain that's lines purpose...
thx you !