2005-2010 have a slip fit style and the 11-14 have a ball fit style I think it's called. And I think the 11-14 might be a tad longer on the tips but can't verify that. The better of the flowing and sounding are the gt500 mufflers.
Thanks for the info. The flanges do not matter, as I will be cutting and welding them in anyway. GT500 ones would be awesome, but I am on the budget, and just want to keep things OEM quiet.