Oh, and there's also a Blitzsafe adapter that has the IP bus plugs for the XM tuner and RCA inputs for an extra audio device. That would work too, if you had a way to control the MP3 player without going into the trunk.

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'88 M3
Conforti chip, Evo airbox/K&N filter, UUC short shift kit, oil pan baffle, Hella H4 lights, OEM glass sunroof
sold: '99 M3 Coupe
Cosmos Black
Airbox baffle removed, ZKW ellipsoid headlights, UUC short shift kit, BMW x-brace, debadged
'96 Jeep Grand Cherokee Laredo V8
(Support Vehicle)