Wiring mp3 player into stock unit

I got mine from http://www.myradiostore.com/
You may not be able to use the GM9-AUX with your 99. The CD head units didn't get the ability to control an external changer (or aux adapter) until late in the 99 model year so it would be a bit of a crap shoot in your case whether it would work or not. If you have a cassette head unit then the adapter will work or you can just get a good cassette adapter for under $20.
Another option is a wired FM modulator. These are not the same as the wireless FM modulators - these plug directly into the antenna cable. This has the advantage of eliminating the weak broadcast of the wireless modulators and it also eliminates interference because it disconnects the original AM/FM antenna while in use.

I got mine from http://www.myradiostore.com/
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I've got an IRIVER Wireless FM Modulator and it works GREAT. $30 on ebay brand new. No static whatsoever, you just have to adjust the volume on the mp3 player and headunit to get the best sound without static. I'd highly recommend it though.
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A quick search has turned up some good wired modulators at Crutchfield (Scosche) and AutoToys. The Scosche has an external power switch rather than automatically switching when it gets signal from the MP3 player. The one at AutoToys doesn't specify brand but the gain crontrol can be worth its weight in gold and it has the automatic switching.






