So I originally put the 4 piston wilwood brake kit on the cuda. I still have drums in the rear. I kept to the 4 piston set because I wanted to stay with stock 15 inch wheels.. Now I am considering 17's which means I can then go to a bigger 6 piston brake caliper and rotor. So what to do with the 4 piston calipers? Could I use them on the rear? Could I get all the other parts for the drum to disc converstion and just use my existing calipers or is it something that would not be worth it?