Even better, check out www.bimmerforums.com
I don't know all the exact differences, but I can list a few:
- M3's front sway bars connect to the strut housing, not the control arm
- larger rear trailing arm (stamped with ///M)
- different size spring perch in the rear (I think)
- sway bar thickness is different
- springs/shocks are different (duh)
... and I am sure there is more.





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