On high rpm's, vanos has no use anyway. It's just for low rpm.
The adjustable ones are for the US engines and if you use standalone management etc.. Mine will just be locked into one position.
Allot of race cars with M-engines are build without the VANOS. It's just another thing that could break...
I have M-Sportfahrwerk, handles like a shit boat. I'm gonna put a cheap coilover set under it, lower it and put some decent tyres on my 17" wheels. 318i on the Nordschleife then, haha!