I dropped 1.5".
Rear: I used the SPF rear adjustable upper arms for camber management.
Front: Advise you stay with the stock upper bearings if at all possible. do NOT use the SPF camber/caster adjustable units. They got problems. If your want to drop more than about 1.5", you start getting into the edgier side of geometry and the solutions get more costly. Now jump over to the tire and wheel thread as there is lots of info over there on this subject![race]