If you lower your car more than a inch you will need a camber kit for F&R.
Make sure you elongate the rear with a dremel though

 

I've got about 1/4" clearance between the SPC rear camber arms and an Eibach Swaybar dropped to 26 3/4" floor-to-fender.

 

I may not have .25 inches based on my rear Eibachs. I bet I will hit.

 

Have you measured each end of the sill to the ground? Is that level or also drooped at the rear?

 

It is from top of wheel arch at the same place (marked) to the level ground of my garage floor. Left and right side were +/-2mm.

 

I never got an alignment or camber arms, and after 2 years my rear tires are bald. Probably from toe to be honest. I would say I put 10K un-lowered miles and 15K lowered miles on them. Fronts are perfectly fine though.

 

toe links - $100
alignment - $100
tires - $$$$

 

your camber can be little off but the toe is the real tire killer.
When I had my Tein S-techs even with the camber kit the best I got was -2.5 camber in the rear