Check out Automotive Entertainment in Pasadena. They do some VERY high end work. My buddy put $25k in to an M3. It had 3 McIntosh amps- the huge ones with transformers on top, Alpine F1 speakers, Alpine F1 sound processor, McIntosh subs mounted infinite baffle, and Alpine DVD/Nav/Screen.

The install was amazing and the sound was awesome. They also did my install in my M3 with custom kick panels and two subs infinite baffle.

http://www.sounddomain.com/ride/193485/2

Ask for Zack or Mike.