I purchased the cobra 75. It is where everything is in the mic. There is a little brain box that mounts out of sight, in looking at the installation the best spot I can find is right above the stereo amp under the dash. Where is the question, has anyone installed any electronics in or around the amp? If you have did you notice any feed back from the device or the stereo? I am going to put a filter in the CB but I don't know if that is enough.