i agree, for just about the same amount of money, you can get a pcm tuning software and get way more out of your stock lq9.
the granatelli is a good product but has been problematic during tunning.
TAZ, for sure you should go SD, also, im not sure if you have seen this, but a MafPro will allow you to, i believe, target a secific a/f ratio under WOT and adjusts your spark/fuel multipliers accordingly. Thus, giving you the opportunity to let say, increase your boost level, in cab, up to 20psi from 15psi and not have to worry about re-writing your pcm EVERYTIME!!
pretty trick huh?
The big names in tunning, like the BS3 have this feature, all you have to do is implement the mafpro into your rig and your set.