Yup, What Jack and Bob said... The effect on the geometry of narrowed arms is negligible. I've used them on a number of cars with little or no effect. Typical front end movement with a coil over is only about 3" anyway, so 1 1/2" of movement from the center of travel does not cause noticeable deviations in the geometry if the set up on the front suspension is done correctly on the initial build and the alignment is spot on.