A ha I just came across this;
http://www.bmwblog.com/2012/08/16/n5...stegates-only/
Interesting enough..
As far as HPFS, I am not afraid of this kind of failure the pump i only 400$ and easy enough to replace. I am interested in potential turbo failure, what collateral damage is possible and cost to get back on the road. And possibly the complexity of the repair as I might, post warranty be doing the work myself.