So for anybody looking to setup Cayenne/Toureg/Q7 caliper on the front of your MKV using 1 piece rotors:
1: 6 Piston Brembo calipers off of a Porsche cayenne/VW toureq/Audi Q7.
-There are two types of calipers 17z designed to fit a 330mm rotor and 17" wheels and 18z designed to fit a 350mm rotor and 18" wheels.
-You also have to consider spoke clearance as the large calipers stick outward much farther and can contact your spokes.
2: Rotors: 2008 ML350 (17z) or 2008 GL450 (18z)
-2008 ML350 rotor specs, These are the rotors to use with 17z calipers
-2008 GL 450 rotor specs, These are the rotors to use with 18z calipers.
3: Caliper mounting hardware from JHM Motorsports.
4: 65mm - 65mm metal hub centric rings.
-These will need to be shortened as not to stick out past the face of the rotor and interfere with mounting the wheels.
5: MkIV .:R32 brake lines.
-Direct fit to MkV brake line and 17z-18z Calipers
The Calipers bolt directly to the stock spindle with the hardware kit from JHM. Rotors are a perfect fit aside from the slightly to large center bore corrected by the hub rings.
17z and 18z calipers used different pads.