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big fan of bilstein my self. I have the PSS9 in my e46 m3 and couldn't be happier. also have the bilstein group N shocks in my E36 M3 race car. great build quality and reliability. I'm almost dead set on the PSS9 for the 135i(when they come out with a kit)
oh ya not positive but I think the H&R super sport kit is just a more sever lowering but with similar spring rates.
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