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FYI, H&R has an MSRP up for the coilovers, 1580.
Re the no OEM, there's more than just height in a spring-> I wouldn't do the ZSP springs if the factory doesn't. I wouldn't want to be stuck with the repair bill. Note, the H&R 330i and 330xi springs have different part numbers (there's a reason).
Consider calling up H&R and ask one of the tech guys about what testing has been done, what issues they have been apprised of, and the like with the XI; there may be some enlightening info. Maybe they can help us better understand what drove the factory away from adding springs to the XI.
I'm probably unnecessarily cautious about lowering the car, but, I don't want to be the guinea pig. I'm waiting to see if the L8(something) guy adds the H&R and if there are any problems.
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