X factor is the amount of clearance from the hub face to the back of the wheel spokes. FC callipers on 230mm rotors would mean half the pad is exposed and not used... this isn't good. Mini Cooper rotors that are in the DBA catalogue, are either 190mm for the early ones, or they start at 276x22 for later ones. Since the FC RX7 are also 276x22, this rules out the post-R50 mini rotors. Lancer Evo are 276x24, so what you lose by going to a 2 piston rather than 4 in the calliper, you gain in rotor thickness. If my calculations are right, then the X-factor required will be minimal with the Evo setup. Both the RX7 and EVO setups require a 15" wheel (the AJPS setup runs a 14" wheel, but does not appear to use all the pad).
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