OK, interesting - when I had a chat to KPM they were pretty solid that I wouldn't need it remapped again - the software produces a curve worked out for a stock standard 318is - there isn't a curve for a supercharged one, so they were satisfied that I wouldn't need it remapped if I added the blower. Quite apart from which I can get a remap a damn sight sooner than I'll be able to afford a supercharger kit.......
Bentley Manual - yes I have heard of them - please can you direct me to the pdf link you posted?