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The lowering isn't the problem. Offsets should be about right, but the tires are too tall (high profiles at 35, sb closer to 25 since they are 20" wheels).
My car at the moment is completely stock. i bought it with the Sports package which came with the 18" wheels and sport tuned suspension. My car compared to some other IS250's looks much lower and there is barley any room between the wheels and the fender. so now I'm wondering how are these 20's going to fit without rubbing? here is a example picture of what i mean :