Turner Motorsport sells a camber kit for the rear of the 135i that I'm pretty sure will adjust more negatively as well as more positively (some camber kits only go positive to "fix" negative camber that results from lowering) but I am not positive on that. You'd have to call and talk to them. You'd only need that if the camber in the rear is not already adjustable with the setup you have, and I'd take it somewhere that does alignments and ask them this question.
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