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I got sport line springs from Eibach. They claim 2.0 inches up front and 1.8 in the rear. It is a huge difference. I got caster camber plates at the suggestion of a bunch of other guys with lowered mustangs that have their cars lowered more than 1.5. The car still drives great. I am not sure if the plates were needed but they look great under the hood and they make alignments easier from what I hear. I had original 99 GT rims when I got it lowered. I switched to Cobra R rims with the 10.5 inch rims on the back. Again the car drives great. The wheel wells look lots better and the rear looks great with 12 inch tires filling it out. My best upgrade so far.