SoundGate and Blitz Safe are supposedly both working on adapters for the unused port (if you don't have the Tape/MD unit) on the back of the head unit. But they have not released them yet. So I went with an FM Modulator adapter for XM's SkyFi Radio. This involved getting the Delphi SkyFi Head Unit, the Car Kit, and the FM Modulator kit. Installed at Circuity City it was around 370 bucks all together. Finding a place to mount the unit was a bit of a challenge, but I ended up finding a place to the right of the LCD display just above the glove compartment.
In the car before I got the mz3, I had a pioneer head unit and IP BUS-connected XM Digital Tuner setup. With the line level on the SkyFi unit at maximum, and the FM station set to 87.9Mhz, the sound quality appears pretty comparable.
So if you are looking to get XM, don't have the tape player, and don't want to wait for a "direct" connection solution, the SkyFi FM Modulation setup works pretty well.
In the car before I got the mz3, I had a pioneer head unit and IP BUS-connected XM Digital Tuner setup. With the line level on the SkyFi unit at maximum, and the FM station set to 87.9Mhz, the sound quality appears pretty comparable.
So if you are looking to get XM, don't have the tape player, and don't want to wait for a "direct" connection solution, the SkyFi FM Modulation setup works pretty well.

