I just received notification last week that BMW would not warranty my 2009 M3’s warped front brake rotors claiming that the wheel studs I had installed caused the warping. The studs were installed long before I had experienced any problems with steering wheel shake during moderate braking. The shake didn't start until after I had attended a BMWCCA driving school last month. I've contacted the dealer's service manager and BMW customer service but they claim they have no authority to overturn the regional field engineer's decision. Since it’s obvious that the studs didn’t cause the warping, it’s my opinion that BMW does not stand behind their equipment if you try and use it as aggressively as it's been advertized. I have spoken to several other BMW owners who have experienced similar issues with their warranty coverage. Beware BMWCCA members. If you attend a sanctioned performance driving school, autocross or similar event, BMW may choose not honor their warranty – or they might find some lame excuse not to as in my case.