I may be wrong but I think you will need a camber kit regardless of what lowering springs you go with.
Umm, you only need camber arms if you go lower than approx. 1.5".
Umm, you only need camber arms if you go lower than approx. 1.5". That puts the rear camber off by enough that the factory parts cannot be adjusted properly when you get an alignment. Eibach pro kits and such don't necessarily need a camber kit because they don't throw the camber off by that much.
I'd ask them if it would fit 2011 models though.