Re: 18's with Brembo?
Not sure but Shelby GT 500 wheels and Roush 18" wheels will clear the Ford Racing Brembo kit which has 14" rotors and 4 piston calipers...
07 Roush 427R, Brembo 14" rotor and four piston calipers
05 GT Mustang, FRPP, FR X pipe, Hurst short throw,
American Racing Torque Thrust 10X20 wheels,
Granettelli tower brace, custom painted flat black grafix, Yellow Optima