If your car has the standard stereo with no amp, then you will need to make a number of changes. First, all of the speaker wires run directly to the radio. (If you have navigation, the radio is in the trunk; otherwise, it is in the dash). So, you will have to reroute the radio's audio signal output wires from the dash to the trunk. Also, you will have to extend all of the speaker wiring from the dash to the trunk as well.

Next, the speaker configurations are totally different. The standard stereo has 3 pairs of speakers-- tweeters and woofers in the front doors, and woofers in the back doors. The front speakers have a passive crossover in the doors. The Active HiFi amp has active crossovers built into the amp, plus that system has more speakers-- it adds midrange speakers to the front doors and tweeters to the rear doors. So, ideally, you would want to add the missing speakers and re-wire the front door speakers so that the wiring runs directly to the amp instead of passing through the crossover.

Finally, you would need to get the two plugs meant for the HiFi amp and connect all of the rerouted wires to the new plugs. There is a link above on this page called "online WDS." That is the BMW wiring diagram software, and your key resource for figuring this change out.

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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