On my 2011 I have:
M3 subframe bushings
M3 front control arms
M3 front and rear sways
Alignment pins pulled for max camber (M3 arms give a bit more too)
1/8th toe out in front
Replaced runflats with Star Specs
= night and day difference over stock for all-around handling. With these mods the stock springs & shocks are actually pretty good for a sporty road setup - as hard as that is to believe (not sure if my opinion would be the same for the progressive springs on the 2008-10 models).
Subframe bushings are not cheap (because of labour to install) but I wouldn't advise anyone to upgrade the shocks/springs before doing the bushings. The soft stockers will always compromise even the best suspension setup.
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