I own a 2004 Yukon 5.3 with a radix supercharger. I have a shop in NY and installed it myself and tuned the truck with the Superchips flasher that it came with. Driving this truck for over a year I know this truck has more power hidden from a good tune. It feels like this truck wants more gas and a timing map to unleash some power. Does anybody have any advise for this setup. I would be willing to also change the heads and the cam if someone knows of a proven combo to make the power. Also do they make any stand alone DFI units that will work also. I have a dyno and tuning it that way would be nice. One more thing the truck is AWD is there any possible way to disconnect the front shaft to ride in a 2wd mode without freaking out the system????? This would save me on gas and produce a nice burnout. Thanks for your input in advance.