So today I tried the following:

1) short out the inputs on the iso max then plugged into the cd changer input
- About the same (but not worse) buzz as an open cd changer plug
2) share the ground across the input and output of ISO max
- same as 1
3) short out cd changer input
less noise but still some popping noise
4 Connect the ipod headphone jack to the CD input (with and without) iso-max
Same amount if noise as using the standard cable

I'm wondering if I'm looking at this improperly.. maybe I need some powerline filtering / grounding? I've also notice that the bi-X headlights will contribute a buzz.

Argh.. all I want is that my Ipod has the same fidelity as the CD player playing Mp3s. I like the control of the ICE>Link but this noise issue is really getting me mad!