went to the track on sun. with my 09GT and ran 12.90's on a drag radial w/stock gears,JLT cai,steeda pulley,hpipe,mag.flo mufflers and evo tune @108mph was very happy with the mph but not the 60' ft times had a set of 4.10's put in today and it feels alot better.
That's darn good for 3.31's, if that's what you had. I've got about the same mods and best I can muster is 13.1. I'm assuming you're closer to sea level too, though.