2 piston caliper in the back should be interesting. The rear piston needs to have a ~46mm diameter. Stoptech, even though they have a 2 piston caliper ST-22, it only can go up to a piston size of 42mm. Hence they just use their well known ST-40 caliper with 4 pistons. I would like to see how this will turn out technically: a 47mm pad with a huge piston.
http://forums.racingbrake.com/showpo...33&postcount=8
But what do I know?...