> Looks like the implementation of the cell-phone mute is a little broken.

Works fine as far as I know - did you configure it correctly from emplode? Note that if you have a car kit that switches from high impedence to 0V you'll need a 10K pull up resistor to get it working.

> Noise - I still get a lot (as much as the mk1) of alternator/engine noise in the car

Did they try a different audio source (e.g. another head unit)? There's no reason for the Mk.2 to suffer any more noise than a regular CD head. Did you have a Mk.1 previously installed? If so, did CCA remember to remove the grounding leads? They forgot this with our A-Class (LOTS of noise) but removing the leads cured the problem completely.

Rob