I spoke to Nitron and their kits require rebuilds far too frequently for my liking. I do not recall the exact frequency right now but it was ridiculous unless you were set up like a race team.
From discussions with KW & Bilstein plus feedback from owners that have run them, I'll be going with TC Kline DA coilover kit. I like what they have done for the M3, their road & track testing is 1st class as are customer reviews. Also I expect it to be lightweight given the aluminium shocks and lighweight custom Swift springs. I'm trying to get a comparison to stock.
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