My son did some digging to find out what amg is using for a pump on the p400 in the Humvee. It appears the pump they are using for it is a ds4831-6033. I think I saw somewhere the engine is rated at 250hp. I'm pretty sure this pump is capable of more than that as one of the pump test stand measurements is 123.1mm3. It looks like this pump came out about the time they started using the cat controller. The overall look of the pump & sensors is the same as the 5521. Obviously, some programming work would be required to run this thing. The satanadyne dealer he spoke with said it showed up as orderable, but he wasn't sure without contacting stanadyne. He did mention a number around $2000.00. Just thought this might interest some of you guys.