Originally Posted by 808elise
Do all E92 m3s have subs under the seat? I did not know there is a sub under the seat. If not how will it be connected? I am interested but would like to know if we can also upgrade these subs.
All M3s have the subs under the front seats. The amplifier powering the subs and the actual subs themselves differ depending on if you got the enhanced premium sound system or not. I didn't get the premium sound but I upgraded those subs and installed a new amp and new speakers in the doors. If you want to listen to it one day, I'd be happy to demo it for you. I live in Mililani too right by the fire station.