tubular frt lower control arms with adjustable ball joints, and camber/caster adjustments for both 2 and 4 bolt designs (2 bolt will be easier obviosly, could use poly bushings or spherical links)
adjustable tie-rod ends to help eliminate bump steer for those that have extremly lowered their car.
frt strut tower braces that bolt to the towers and the firewall for added rigidity.
thats all i can think of for now.
