All the adapter seems to be in a little harness that plugs into the stock harness. Hasn't anyone just done a simple splice into the wiring w/ parts from Radio Shack? I was reading on E46Fanatics that someone did a writeup using a simple $5 3.5mm input jack, cut of the the end and wire tapped it to the stock wiring, in and out for under $10....but of course I can't find the write-up anywhere  I've done aux inputs kits like these from ebay on Alpine, Kenwood, etc decks in the past so I can stream online radio from my Treo into my 740iL, so spending 4x as much to do it in the X5 kinda sucks.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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