Hello, I am trying to replace the factory head unit on the 2005 VW Touareg and found out through trial and error that it does not play well with the "crutchfield" harnesses. I can see from searching that this is a common issue for this vehicle (digital factory amp). I can't find any solutions for this replacement. Has anyone successfully replaced the head unit and still maintained the 11 speaker sound system in the Treg? If so, I would be very interested in purchasing the same setup. Any help would be appreciated. My main goal is to have a bluetooth streaming setup in the radio, and would love to have hands free calling.