Recently My brother purchased the Edge EZ for his new '06/6-spd dually 4x4, and my nephew bought the same box for his '05/6-spd 4x4, both are complaining about a hesitation at high cruise speeds, say like 75 mph and up, both say that their trucks act like they are hesitating slightly, but noticeable. Anyone have any idea what this may be? They both have cold-air intake systems and straight piped exhaust(even removed cats)Everything else is stock. They say trucks don't do it on level 2 or 1, only doing this on level 3. I think the lift pump can't keep up with the cp-3 needs and maybe being drawn down to 0psi, and they need to install aftermarket fuel pump. Anybody's ideas welcome, thanks