The sound quality is awesome, no complaints. My primary objectives were to keep the factory head unit so the Bluetooth and MID functions would still work. I need to keep a useable trunk so this solution worked for my needs!
2003 530i Titanium Grey/Black, Premium and Cold Weather Package, Ultimate Pedals, iceLink iPod Kit, Bluetooth, M5 Deck Lid Spoiler, M5 Rear Sway Bar, M5 Dead Pedal, DINAN S1 Trans and Engine SW, BSW 12' subwoofer, Valentine V1 hardwired, SMG Paddleshift kit
2005 X5 Sterling Grey/Truffle Brown, Premium and Cold Weather Package, DICE iPod Kit, Bluetooth, DSP, Comfort seats, Invision DVD Headrests, Valentine V1 hardwired, TomTom GPS