First, let's clear something up. Was the same wiring and amps used in this MK2 installation as were used in your previous MK1 installation? What's changed between the two installs?

Another thing to check. Try wiggling the unit in the docking cage and see if the noise changes. My MK1 recently developed a similar noise that goes away as I wiggle it in the docking cage. There's something wrong with docking connector (dirty perhaps) and it's causing grounding problems. I need to look into it.

Triple check all your wiring, and test the unit while the docking sleeve is de-installed from the vehicle (i.e., the wiring is still connected to the car but the docking sleeve is sitting in your lap). Narrow it down by elimination.

___________
Tony Fabris