A lot of people upgrade the rear bump stops to Z8/6er units. Dinan sells these as a kit for 1er's. I think it retails for around $100. I've also heard of people using the 6er rear spring perches(made out of rubber)pad under the rear springs.
Personally I am in the same boat as you... IDK if I should go with Bilstein B12 kit or with a KW street kit.
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