Originally Posted by lthai
The loudest would probably Gintani or Meisterchaft. Eisenmann race is up there too. Are you sure you want to have a loud race exhaust with a child in the car? And try to hear exhausts in real ife. Youtube videos don't do them justice.
A valved system would be best...thats what I have on the TT. I can put it in a race or cruise mode. Havent heard of one for the M3 though. I'm fine having a child with it...hell, still need some fun myself. Its not like I'd contemplate straight pipes though.