This post helped me a lot, so thanks for all the info. I just installed the M27 today. Thought I'd post my experience, maybe help someone else out or stir some new ideas for projects. (sorry if pics aren't too good....camera on phone):
First, I ended up installing the head units on the top level of the grill using just the molding tape method. They fit just fine without cutting the little vertical pieces on the grill, and out of the way of the tow hook:
IMAG0022.jpg
Next to run the wires. I had sort of planned on running to driver's side via the existing gromet mentioned in an earlier post. But, I have the 6MT (no extra hole by my brake cylinder):
IMAG0011.jpg
So, I decided to run them along the hood release cable via the wheel well to the driver's firewall. Yes, I had to remove the wheel and well lining, like in the OP:
IMAG0014.jpg
IMAG0015.jpg
Drilled a new hole for running cables through firewall just below the hood release pass through (ended up being bigger than this):
IMAG0016.jpg
Since I have a ZR, all three middle console switches are in use, as is the S-mode switch location. I didn't want to drill my dash or anything else permanent, so I came up with a nifty mount, low by my right knee location:
IMAG0017.jpg
IMAG0018.jpg
IMAG0019.jpg
IMAG0020.jpg
IMAG0021.jpg
All in all, went pretty well. Now to go test it out.
