I drove a 2010 and absolutly loved the car. The feel, the power, the handling. Was just great and in black the body armor and tail kinda blend better and look nicer. I will be getting a 2011 GT someday... hopefully by this time next year I can afford a slightly used one or maybe summer 2011. I really like the car and it will be nice to have something that I cant really mod. The brakes are already Brembo 4 pistons, already has a 6 speed and with its design the engine will not benefit from any exhaust or intake mods as the parts it has are already excellent. A tune may bump it 8 hp but and exahust or CAI will not do anything for it.
Also with a 11:1 compression ratio I would be afraid to put a blower on it.
Heres a video of it and a dyno run:
http://www.stangnet.com/2009/12/28/2011-mustang-gt-5-0-video-of-dyno-and-cruising-runs/