XM Direct is compatible with BMWs, only if you don't have Nav. I had it in my '04 X3. If however, Eric5273 is referrring to a regular plug 'n' play XM system available at, say, Best Buy, I'm almost positive those systems are compatible.

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I'll drink your poison if you fill the cup. You make me crazy, baby, don't let up.
Break Free, DMB 2006