I have no idea if this is any good or not, but I love the ride of the Eibach Pro Kit springs on my E46M3 and E90M3. More comfortable than stock for a street ride, yet when the cornering gets energetic, the progressive rate nature of the springs kick in (higher rate w/more compression) and things stiffen right up to where you want it.

For $300 for springs and shocks (all 4!!!), this is a no brainer to me. I have no idea how they can make money on these... No affiliation w/vendor, etc.

http://www.autohance.com/eibach-2076...FVBlfgodF6kGdQ

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual