KW has a new Clubsport line, which has a beefier body and linear spring. Some have camber plates too...
Personally I agree with Dammmittt in that suspension bits for the Z4 M are not an absolute must. I'd rather spend the $2,000 on a shorter final drive diff ratio (i.e., 3.91). With that diff ratio our cars can out-accelerate the new M3.
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'08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel
'07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU
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