Yes Read the following sticky so you can get familer with what's in the car.
If you are somewhat skilled with small tools you can do this yourself.
Be highly skeptical of the common shops as they are not likely to know the quirks of this car .
http://www.e90post.com/forums/showthread.php?t=641323
The Musicar kits are the most user friendly way to upgrade they come complete
with factory connectors, amp mount boards , the amp and crossovers are already setup,all adapters and harnesses included. You can customize it from a smorgasbord of already proven configurations. No crimping or soldering required.