I have kw clubsport, albeit and another platform ( s/C Z4m) and they are phenomenal, they car performs on track sooooo well, the only issue i have is they are ROCK solid.... imo not very DDable..... they would drive you nuts.... again could be different on the m3s...... On the track or sprint circuits, warm sticky tyres, they are faultless, definitely one of my fave purchases, i really enjoyed bolting it all together as well, everything fit like oem parts, the quality is first rate, they do not make the slightest creak, which is nice!!!
when Bmw stick them on their GTS model that 100k plus over here in the UK..... you know its a solid setup!!!
Pristine Bi-colour Ti /Bsm...z4m roadster Ess vt2-500....Perfection on wheels.