Basil
Through various links, I have access to some info from Alpina, hence the above.
The trouble is, the modifications they do are tried and tested via some very exhaustive tests, prior to being shown to BMW themselves (they have a cursory interest as you can imagine-warranty issues etc)
Alpina’s stds are very high so they make sure every car they produce is worthy of both BMW and Alpina’s name.
When, not sure, I can’t find out! How much, again the same answer, but output, 200bhp plus a healthy increase in torque is probably garaunteed, and will more than likely form the base engine spec, with more to come. (they always increase on base BMW’s one way or another, for example their B3.3 is a serious M3 rival), and yes it is more than likely to retain the supercharger.
But at the end of the day we’ll have to wait with baited breath.
I’d put my name down when it does arrive!