Did you buy the amp to replace an existing amp or to upgrade your car? If you bought it to upgrade the car, then you will probably have to do some additional wiring, as the cars are specifically wired for the type of amps (or no amp), and there are no extra plugs for any kind of upgrade.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input