You know, I don't think the upgrade to the four pistons is all that much. That's the way to do it, ya know....
Edit: (from the ERA 427 Options Page)
Competition [front brakes]: Includes 4 piston alloy calipers, 12.2" directionally vented rotors, custom hats, caliper brackets, hoses & hardware. Requires spindle modifications ... $1500
Spindle modifications, add ... $100