My GT was entered in both group 11 (special group for GT40's) and Group 10 (Le Mans prototypes, GTP cars, Corvette C6R's, Modern Trans-Am, IMSA...). Group 11 turned out to be a bit of a disapointment as it turned into a pace-car led touring group for the Post-Historic cars, meaning Ford GT's. Group 10 was also not really a good fit for the GT as it included much faster cars like Audi R8 Le Mans Prototypes. None the less I ran it for a few sessions in group 10 anyways. Actually passed modern Mustang Trans-Am car and Porsche RSR.
We brought brought both the GT and Mclaren into Elkhart Lake Friday night for the Race Car concourse. The race cars are lined up and driven into town to what is in effect a huge party. It was a lot of fun. The GT fit right into that group. The Mclaren actually won a Road & Track award.
The Mclaren M8F was entered in Group 7. Won the Saturday qualifying race but broke an input shaft during the first lap of the Sunday race.
Below are a couple pics of the cars and a link to some in-car video from the Mclaren.
http://www.youtube.com/watch?v=ZBNh8LMShyE