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As per mine experience, the following mods are the most important and have the most effect on "sloppiness" elimination (from strongest to weakest):
1) Rear subframe bushings (or Powerflex inserts in front ones as those are difficult to fit)
2) Springs (or whole coilovers)
3) Shocks (if coilovers were not installed in part 2)
4) M3 E93 front sway bar (more effect in steering accuracy and bumps suspension noise elimination)
5) M3 front control arms (more effect in steering accuracy and bumps suspension noise elimination)
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'13 F30 320i (328i ECU) RWD M-Sport
Michelin PSS, M-Sport brakes, 320i LCI muffler
F32 bottom V-bar
F80 bottom reinforcement plate
Koni Sport, M-Performance springs, M135i Anti-roll bars
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