Ade,
majority of the Bimmer owners would send their rides to Eng Spray Painting. I am not a huge fan of theirs, as when i got my 325i earlier on, there was a slight scratch on it and AB sent it there for respraying and it didnt turn out well even after 5 times of respraying. Took it out to Nanyang and AB footed the bill (and a new bonnet).
Nowadays, a lot of people tend to send their rides to Kim Siah and "telinga hitam"... but if you're into crafty works with lower cost, I just know where the place to go.