I had a vacuum line come off on my 535i when it had a few hundred km on it from new.

The new petrol engines are all going to be turbocharged, but they aren't twin turbos. BMW is using a single turbo, but calling it twin-power. Marketing.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue