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I hope this isn't useless information but I had KWV1 on a Non-M E86 and Bilstein PSS coilovers on an e46.... my personal experience....granted different cars was that the V1 rode better. I blew a strut on the PSS coil overs. I had over 60K on the KWS maybe about 40K ok the Bilsteins. I feel if the KWS held up better on a more stiff and rigid chassis then you're probably better off with them.
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