It's Gran Turismo Omologato. And it's Eye-talian for Homologated Grand Touring. Basically a Euro racing class based on production vehicles. I guess GTO sounds way cooler than Gran Turismo Omologato. I'm not positive but they (Pontiac) might have been trying to trick people into thinking the Pontiac GTO and the Ferrari GTO were of the same caliber... ???
They'll be out in force at the Long Beach Gran Prix in 5 weeks. A Trans Am car is like a NASCAR vehicle on an 800 lb diet. With slightly smaller motors, but wider tires, better braking and better downforce. And you won't hear "yall" or "dang" out on the track.