stringtheoryGive Realspeed a call. There's more to the job than lowering springs. You'll need an adjustable panhard bar and jounce bumpers. For me they recommended the Steeda Springs as they lower the car approximately 1" with a good ride quality. Once I get my act together, they will be doing this work and some other upgrades to mine.
ANGIE 06Wheel Hop ! Ford Racing SVT lower control arms and BMR adj. upper control arm and mount !! That's how I roll !!