Thank you so much for your quick reply :-)
Maybe I'm just being nervous of no reason, but I know they're going to punish me big time, if they find out about the SC.
I'll try to install the old belt and not telling anything about the SC - but they are going to look at the engine, since they are checking the engine for oil leakage and the engine number.
The good thing is that the ESS unit look very "build by the BMW factory"'ish.
Ok, I just have to cross my fingers...
Hans - if you are reading this, could you give me a call? Thx :-D