Slotted Rotors on Pettit site
 

anyone know what kind of slotted rotors are on the brake page?

http://www.pettitracing.com/rx8/index.htm

Looks kind've like Powerslot units.

for 1 pc rotors you'll do a lot better here:

http://www.racingbrake.com/MAZDA_RX8_s/235.htm

or for some extra money you can knock off some weight, see the 2-pc rotor thread in the Competition/Racing forum, there is a reducd cost pre-sale link there