I think Mike(crash) may have mentioned about tires. Adding wider tires on the GTM is probably not the ticket for you right now. The car is notorious for not getting heat in the front tires in race conditions. With 275/17's it took about three years to figure out how to get the correct heat. Went to 295's and lost 30 degrees. The GTM is pretty light in the front and deals with a mid range push. Even using big canards, it still develops a mid entry push. Notice on some more recent photos of the PDG car with open cut fenders and the stock holes in the nose have been moved as far back as the stock frame and accessories allow. Last outing the driver reported no push and tire temps were perfect along with wear. However, the openings in the nose made the rear a little too loose and now they are looking to widen the rear tires from 315 to 335/345.

cheers