The Grand-Am BMW is a tube frame. They decided to go with the longer wheelbase, larger M6 body due to aerodynamics advantage. I understand that the DTM cars will be racing in a parallel series to Grand Am in the next year or two, along with the Japanese Super GT. I have heard that they will be in a separate race, so as not to upstage the DP cars. (DP cars are way more primitave than the carbonfiber monocoque, highly aerodynamic, high tech engine DTM cars)
I wish the ACO and FIA would allow the BMW E92 M3 GT2 to run to the same specification as the VLN/Nordschleife 24 Stunden. They had to reduce engine power, take off ABS, and change the rear subframe/suspension for things like LeMans and Spa 24. The VLN let them run what they had, but with 10 kilos or so of weight penalty.
ALMS lets them run like they want and the bigger engine restrictor lets them be super fast on the straights for Road America. The Dunlop tires hold them up sometimes. Ferrari has the edge on the fast sweeping tracks like Mosport. The Porsches still seem to be able to win on the tighter tracks like Lime Rock where traction out of tight turns, trail braking and rotation come into play. All in all, the ALMS has such a great balance of performance that means lots of competition and anyone can win at any racetrack, should there be unforseen incidents.
BMW won the manufacturer's and team title by 1 point over Porsche and Flying Lizard, though Joerg and Patrick won the Drivers title by a much bigger margin.
The new Ferrari looks like trouble the 430 was hard enough to beat; often but not always it was faster than the RSR. The 997RSR is getting quite old now.
I am going to hope the 458s all burst into flames.
