I agree with bird_dog, think of it this way, SVT built that turbo car with bigger brakes and just so happened to be 5 lug to boot, that model was pointed towards the road coarse twisty stuff,
Not that stock mustang brakes aren't adequate for everyday driving, they do the job. Adequately.
Not that stock mustang brakes aren't adequate for everyday driving, they do the job. Adequately.