If you are talking about tramlining, check you tyre pressure. In my case it was the culprit. I had put wider tyres in the E46 M3 - in fact it was CSL wheels on a normal M3 - and it was tramlining. Can't remembers whether increasing or decreasing fix it. No such issues with the E92 to date.
2007 E92 6MT - Silverstone II with Extended Black and /// Performance Exhaust and BPM Sport Tune
2011 F25 X3 3.0d