The Nitron stuff looks legit. It's poplar with the lotus crowd.
But it's limited stateside. I only know of one e90 on mpost that has one. But if you look at the hardware and assembly detail it looks to be a good setup. I think the rates they ship with are kind of soft for a track only setup.
One thing to know though is the Nitron rear is a true coilover so you will want to reinforce the rear shock towers if you go to high rates.
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