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Originally Posted by Krimson X
Its relatively inexpesnive at approx $40.00. Instead of transmitting wirelessly through the air or through the tape deck (if you have one), it attaches from the XM unit to the deck via the antenna jack located on the back of the radio unit. The XM direct connect kit is very different from the Sirius kit. Still, you have to tune in to a radio frequency, but the signal is much clearer and stronger. It does not give you control of your satellite unit through the steering wheel controls.
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Thanks for the info. I was a little unsure of how my Alpine controller worked because it was already installed when I purchased the car. After a little research, it appears to be an FM modulator with no direct connection. It looks like a cable would have to be run from the Sirius box in back of the X5 to the head unit in the dash in order to make the direct connection. I am a little hesitant to do that becasue I have not had the best luck with car audio techs taking enough care when removing and installing the interior panels. They never seem to fit exactly as tight as they were from the BMW factory.
I have an aftermarket Alpine head unit in my 94 325i that controls Sirius with a direct connection and you are right, the sound is much more clear with that type of connection.