The 2005-2009 have the S197 body and while I can tell the difference between the various models, I can't tell the same model apart from different model years between 05 and 09. The 2010 V6's have the new body with the old hamster under the hood and single exhaust. 2011+ have the 305hp motor, factory dual exhaust and a few interior changes with a few systems the earlier cars didn't do.
2010 GT's actually say "GT" on the fender badges. 2011+ GT's come with the Coyote motor and have "5.0" badges.