[REDSC400]

There are some "new" systems that manifest themselves as a pure remote control human interface. This allows you to not clutter up the dash with electronics. You can hide the system in the trunk area. The speakers are another matter.

The interference from our typically non-supressed high performance inginition systems is an all together different issue that could be a problem with a sound system which runs off of the Cobras DC power system.

On a long drive, I find a simple CD-Walkman or MP3 player with earbud headphones to be an effective, low tech, and high fidelity alternative that is immune from iginition static issues and at the same time somewhat isolates the exhaust noise from the audio.
There are wireless modes for the headphone earbuds as well.

I would consider this route as more that a viable alternative.