My Auxmod came in less than a week. I installed it in less than 20 minutes. Sounds 100% times better than using the fm modulator on my XM SkyFi2.
I simply popped the 2 caps on each side of the radio,
...popped the cap off of the bottom part of the radio (tape deck area),
...stuck some small precision screwdrivers in the 4 holes,
...I squeezed the screwdrivers inward and had someone else stick their hand through the bottom (tape deck area) and pull out the radio.
..connected the aux mod, connected a y adapter to connect to the ground loop iso, back to another y adapter..to my SkyFi2. My XM never sounded better.
Kudos for AUXMOD...it's the shiznit...