when you lower your car, there will be excessive negative camber. my camber was about 1.8 which was WAAAAYYY off from normal levels. after I got caster/
camber plates, I'm at 1.2 now and it's been that way ever since.
Maximum Motorsports has this to say about caster/
camber plates:
Q. I am going to be lowering my car. Do I need caster/
camber plates?
A. In a word - yes. After lowering your Mustang, you will need to have an alignment done. Typically, there is not enough range of adjustment in the stock upper strut mount to achieve a correct alignment on a lowered car, which will result in poor tire wear and handling. MM Caster/
Camber Plates allow a much wider range of adjustment than the stock upper strut mount, which makes a proper alignment possible. Additionally, MM Caster/
Camber Plates add 1" of bump travel, which regains some of the
suspension travel lost on lowered cars.