Since, you have been through the grounding issue and have not found anything there. I would not say it was the coil either. It is starting to sound like the wires. Strange that they would cause such an interferance with the radio. I bet it is one wire that is having issues.
Did you ever go back to the stock wires running the demon? Or did I miss that post? :?:
'05 Fire Red V6 Mustang | Custom X Pipe Dual Exhaust | Magnaflow Mufflers | JLT CIA | At the Moment 89 Octane Tune | MyColor Gauges | Eclipse Stereo | Focal Speakers |