What kind of interface are you using to send and receive iBUS messages? I'm in the process of building the interface from restlers site to work with NEXUS 7. I will have to figure out how to fix the alternator whine before attempting this idea.

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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg.
2010 X5 4.8i w/ Sport Pkg at 19,000 miles