I've got an 03' 5 speed. I am going to install the Powermax CR. I've heard of some problems with it blowing turbos. Whats a safe level to run it at without popping the turbo? Are the digital guages as accurate as the normal guages you would run? Also, Hows the head gaskets holding? What pressures will these new ones handle, or is it just luck of the draw like with the other trucks?