Interesting article on Vengeance Racing's research on the LT4 heat soak/IATs and GM's conservative tuning. Vengeance was able to go from 585 to 660 rwhp with just a CAI, smaller pulley, and a less conservative ECM remap. GM's response in the article would probably be echoed by Edelbrock and Magnuson if you were able to get them to discuss their canned tunes in the open.
http://www.autoevolution.com/news/20...tup-89790.html
Just food for thought.