If you want real stopping power then I'd suggest Harrop, next step down would be 6 piston brembos as standard on the GT-P. Have a talk with Matt from Racebrakes, he will have lots of good info and prices for you. I installed 4000 series rotors and Ferodo DS pads to my FG Turbo and they performed very well for spirited street use and at Wakfield Park but if you want the best then big rotors and calipers are the go. Benny.