Can't wait for the Hamann cats man, I'm actually a little excited for someone else's car! Haha
It would most definitely be right up there in the loudest car in India category.
And yes, the M3 is pure understated indulgence. I saw one last August in a Mumbai investment bank where I interned, and not a soul paid attention to it, besides me of course. It was in a rare sky blue, running on 18s with the CF roof. Nice combo and I don't think I've seen it pictured here on TBhp.
Anyhoo, enjoy. Btw, I may be joining the BMW family by purchasing a 5/6, but it's still unconfirmed!