The way the club sport model differs is with aerodynamic changes to increase downforce at the track. A new front splitter, widened wheel arches, redesigned side sills, air vents on the front fenders, and a new roof. The widened body allows the club sport to ride on 345 width tires in back
The club sport is actually the cheapest GT9 model at $565,000. The GT9 and GT9-R cost $701,000 and $987,000 respectively. Not cheap, but this is a very unique mid-engine car that essentially shows what the 911 could evolve to. It is even available in an automotic/tiptronic model for those who want to maintain daily civility with a 1000+ horsepower mid-engine car not dealing with the noise single mass flywheel of the manual model. Awesome? Definitely.