I will definitely use their products. A few quick questions:
1. Did you have the standard sound system to begin with?
2. Was the transition pretty amazing?
3. How much did the total conversion cost? I need to budget with my wife. ;-)
4. If you replaced the stock subs are you getting the right balance of bass?
Hoeferland | 2008 E90 M3 | Alpine White | 6MT | 20" HRE P40s | Full Active Autowerke Cat-less Signature System | BPMSport Tune | Eibach Springs & E36 Bumps | Active Autowerke Underdrive Pulley