Hi all. I'm in Australia and I run a 6.5L P400 Cobra engine in a non standard 1988 British Range Rover. This is a constant 4WD vehicle weighing in at just under 3 Tonne. The injector pump is a standard (but ceramic coated) Stanadyne rotary DB2 pump. This engine peaks out at around 200HP (at the crank) 170HP at the rear wheels. The output will be less if measured on 4WD Dyno which wasn't available to me. My question is: are there upgraded DB2 pumps available to produce substantially more HP and if there are, does anyone have experience/ reports on these upgraded pumps. I have reviewed a website for "Classic Diesel Designs" who list various upgraded DB2 pumps (obviously not all for GM engines). They list for example a 130cc DB2 pump for GM 6.2/6.5 rated at 400HP. Your opinions and advice greatly appreciated.