[clarence]

For those who do not believe in binning, pls be constructive & put forward ur ideas as to how BMW decides to label which of their low compression N20's as U0's & which ones as O0's. Don't know is not an answer & "there must be sth different" is also not valid (cos already confirmed low compression U0 is part for part identical to O0).

Also, power variation between identical engines is not fantasy. On Feb 2013 issue of Automobile, they did a comparison test between an Alpina B7 and an Audi S8. They put both of those cars on the dyno. The Alpina underperformed significantly when compared to factory specs. This is after a 20% drivetrain loss allowance. Don't forget BMW made those engines specially for Alpina.