Is it true you can fit B5 RS4 Calipers straight onto S4 hangers? If this is the case, do you then just need a set of the RS4 Disks to make this a cheap upgrade from the standard S4 brake system? Also Ive seen threads that say there are Porsche Calipers that fit straight on the S4, does anyone know which porsche models will fit a S4, and will any run with the standard 323mm S4 disks? I have recently upgraded my disks and pads to black diamond, which makes a hell of a difference from high speed, but Im still interested in uprating the calipers themselves, but have not got the silly money for 6-8 potters.