It's kinda both click on the search along the above header, then type in EAS or look out for their advertisment on the web site they usually UPS out their material and have you locate an installer. They installed it for me since I live close to Orange County, Ca. I will tell you though this system is the SHIT!!!!

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2006 X5 3.0 Sport
Stratus Silver
Sport Package
DVD/TV/NAV - BY EAS
Premium Package
Climate Control
InVison DVD System
Sirius Sat. Radio
Black Leather Interior
Ractive Chrome Tips
Alum. Running Boards
Zinik Custom 20's Wheels
Yokahama Advan St Tires