(EDIT) These brakes require at least 18 inch wheels.
I have not driven the car yet. I just finished installing the kit. I will find out tomorrow or the day after how good it is.
No there is no proportioning valve and I don't think I will need one, we'll see.
I don't have exact measurements but here's a picture. The top one is the brembo bracket. I used the studs off of it which needed to be turned and threaded on the bracket end. The rotors need a thin spacer to center on the mkiii hub. I will provide exact measurements of the brackets later.