I use PSC on my e46 M3 and I'm running 3.6 deg of neg camber; however, with the e9x M3 you can get away with a little less neg camber so I'd recommend starting somewhere in the 2.5-3.0 deg range, probably closer to 3.0, to get the most out of the tire. R-comps like neg camber!
Is this a street-track car or dedicated track car? Obviously running -3 deg of camber on the street is not the greatest for tire longevity.
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