I upgraded to a Stoptech 4 pot caliper and 355 mm 2 piece rotor. After spending the $$ I realized all I really needed were better brake pads or cooling ducts. The stock brakes are plenty with the right pads. What the hay, now I can abuse them all day and drink ice tea while all the rest are bleeding their brake fluid. Incidentally, our cars weigh more or less the same as a Z06.

Les