I'll go out on a limb and say yes, especially if the car will be lowered significantly from stock. There's just not enough adjustability in the stock pieces with the factory set-up, and I don't see why coilovers would be any different.
I just ordered UPR coil overs and caster/camber plates. Thanks for the help. I wasn't planning on buying either, but I just completed installing a QA1 k member and a manual rack. I cut one turn off the front 4 cyclinder springs and it's way too low now. I thought I was being consevrative. The negative camber is crazy like this. Now I'll have full height adjustability.