Quote:
Originally Posted by TheSt|G
Saying that the tires adversely impacted the car is to miss the real problem. When you switch from an all season run flat to a max performance summer, you are seriously bumping the level of grip. That new grip creates additional load for the suspension, which will essentially fall on its face as it is not designed for such use. This is when upgrading bushings and struts becomes essential to restore balance.
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Switching to non run flat performance tires is a benefit, but like the STIG said above that switch will further expose the weak link in the car which is the stock suspension, especially the dampers. Going with non run flat tires and upgrading the suspension (new dampers/springs or coil overs and some M3 suspension pieces) will transform the car.