Jon did do the tune and seemed to really know his stuff. It was actually a dyno tune so they also did the dyno. If I can figure out how to get the graph below 19.5 kb I'll post it and see if some of you guys can make sense of the outcome. It shows some strange things, like torque rated above HP and a 50+ HP and FtLb dip at 2500 rpm. At this point I'm thinking that something I've done on the install is the limiting factor but I can't figure out what. Either that or GMPP seriously overrated this engine. It does sound great and throttle response is awesome.

By the way, how do your tuners dyno trucks without reaching speeds beyond the tires rating?