Just trim 1/2 to 2/3's of one coil off the stock rear coil and it sits absolutely level. spring load and ride stay the same. rate increases by a hair about 15 lbs rate. Start with 1/2 coil and drive it. super simple mod. Remember that the cars sit higher in the rear anticipating load. Like 4 people and or a trunk full of "stuff". my car is level but on a trip to the hard wear store loading up the trunk with home improvement junk, tools, and a full tank, I can notice a little lower ride height in the rear. I use the car like a dam truck sometimes
You MUST re-aline the rear even for that slight of a drop. These cars have RADICAL negative camber gain on a already huge static negative camber setting. Choices or adjustable bushings or change all the control arms.When re-alining you can get rid of as much negative camber as you want and you will gain forward bite. I run only negative -.5 and plan on reducing it even more. It will still handle real good due to two things:
Number one the huge negative gain when the outside wheel compresses in the corner. It will still have 1 to 1.5 negative under hard lateral load.
Number two these cars push like crazy into a corner so if you remove some negative Rear camber which helps the cornering grip you actually will gain some handling on a relatively stock machine. Get that ?? reduce lateral grip on rear and improve cornering. I have tracked it more that drag racing it and it works. Now the guy with sticky Hoosiers will be different....,