I ran into this article from 2005 about Roush's designing of the 05 G6 sedan. This tuner looks intense. I thought we could toss around ideas as to how we could go from stock to this (or close to).
http://jalopnik.com/137947/gm-gives-love-to-roush-for-g6-tuner
http://jalopnik.com/137947/gm-gives-love-to-roush-for-g6-tuner