Originally Posted by prerunnergreg

a quick synopsis of what is entailed to build these...CTS-v rotors and calipers. The rotors need to be machined to accept the x5 hub...bolt pattern is the same 5 on 120mm and retaining bolt will need to be drilled/chamfered. the calipers can be mounted one of 2 ways, both require machining. the simpler way I did was to machine the mounting tabs down to clear the spindle, drill and tap for 5/8 bolts in the caliper in the new bolt locations. machine/drill brake tabs on spindle to 5/8, machine a .667 stand-off for the proper offset. The other method will require more machining of the caliper and to build them into a radial mount...i may still do this but im feeling lazy on this project now as it works great currently. you will need a 10mm banjo for the caliper to -3 braided line to -3 to 10mm single flare to adapt to the factory brake line. Clearances with a 20" wheel were close with the knock-off wheels but have plenty with the my new wheels factory wheels. Total cost was about $500 and about 8 hrs time....mostly measuring and fitting.
The only pic i have during the fit-up

new satin finished wheels....same wheel as before just much nicer looking