Got a mail back from ACPT and my carbon shaft is on order!
ACPT driveshaft is $1400.00 for the version 1 (800 ft/lbs of torque) plenty for my circuit car, they also make a bigger one, slightly heavier and more expensive, for drag cars with up to 2000ft/lbs of torque. $200-250.00 for overseas shipping.
I'll let everyone know how it goes!