I know this thread is about a month and a half old, but having worked for an audio shop, mercedes can be a pain to install systems into. We had a heck of a time trying to get a Alpine hide-away unit to work properly, but running wires isnt that bad for a system. Most installs will require the removal of the backseat or someone going fishing in the trunk. Also, the biggest headache for any system when trying to use a stock deck is using high/low level adapters. They works ok, but dont off the control that an aftermarket deck offers. Sorry for posting in this old thread.
