There's one in Daytona next weekend. It's called the Rolex 24! Many M3s in the Continental race on Friday and 2 (Turner) in the Rolex race. Lots of M3s in the paddock, too.
2008 E90 M3 - Dinan Stage 3 and BBS CH's
2000 328i sedan (UUC suspension - still the favorite)
2012 Mini Cooper (wife's)
1991 325iX (sold - gone but not forgotten!)
2011 X3 (Performance Center delivery done May '11)