Texas '03 w/ Twins makes 612hp on #2 only...

[lmills]

That's what I was thinking also. Maybe a modified CP3 is needed for fuel delivery.

 

[Idaho CTD]

Also what kind of egt's is this 600hp truck putting out? Those numbers are nice on a dyno, but what about floored up a grade?

I floored mine the other day going up a 7% grade with my 4 wheeler in the back. All the box settings were the same as I run on the track and about 100mph, when I let off, my egt's were 1350*. With the pressure box only it peaks around 1150 and then backs down to 1100* (420hp without TST). My truck has dynoed 586hp before with two boxes, twins, and a baby set of edms. Ya gotta love twins!