Whats up Guys?

Im lookin to buy a new truck pretty soon (lookin into the Denali since it has the 6.2) and i am lookin to get it turboed sometime next year.. i know it will be 07+nnbs and i was wondering what everyone thinks about the 6 speed that is it in....

Basically is it a good trans? strong like a 4l80? is it faster since it is 6 speed? will it hold up to around 600hp maybe a lil over?

and by the way ive learned a good bit on this site in the short time i have been on it so just wanna say thanks to everyone especially NP.