Some of the folks over on gmfullsize.com are trying to get Justin to head down to New Orleans, LA again to do some tuning (March 6-8). They need 10+ tunes to make this happen and they are close. Please refer to this thread if you are interested:
http://www.gmfullsize.com/forum/showthread.php?t=141697
http://www.gmfullsize.com/forum/showthread.php?t=141697