Wow, I am experiencing the same problem with my B-1, not sure what to do, on 4x3 on my drag box, I am only able to get down to 1200 pre-turbo egt's, pulling a tiny holiday trailer, with the Drag off, they are higher, and as to the comment that bigger injectors will cool your egt's, I saw the opposite myself, not what I was looking for, we are going to change the exh housing on the B-1 and see if that helps... ... any other suggestions? These injectors are pretty much equivalent to a Jammer 4 or more, I make smoke with the Drag box shut off, with the box on, it is even worse, I need to go in neutral at the lights to keep it from making smoke, on level 4x3 with no load, I can hit 1600 egt's without much effort, lot's of power though.....