I have emailed this company http://www.compbrake.co.uk/ regarding a brake setup for the VXR. They are willing to design one but they require a car for the measurements. the kits seem very well priced at under £900 (the price would need to be confirmed)
Also the pads and discs seem like a good price.
The size kit they do is 350mm x 32mm 6pot
they do a few different calliper designs.
If you are interested in being the test car please get in contact with them
and they even do a carbon effect one to