Any way you cut it, it has too small of a piston setup so it will have less clamping force than stock, and pad deflection is unchanged from stock. The stock calipers are far more rigid than these are too. If you want a REAL performance upgrade get the Superlite 4 calipers with the 12 inch rotor and the aluminum hat setup. You'll cut sprung weight, increase braking force, and increase cooling capability. SL4 setup is a true performance upgrade, and will fit SOME 15 inch wheels.