What do you people think is the better choice between the Arizona Z car big brake upgrade, and the Greddy "Grex" upgrade? They both offer similar 13" 2 piece rotors, 6 piston pots,etc... I will be using it at the track as much as possible, and use it for dd. The greddy also comes in 4 piston form, should that be a big enough diff in clamping power to get the 6? Please only give oppions of those 2, and why you'd make that decison. The price isnt an issue in this case, just performance.
