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Message: [QUOTE="Power Hungry, post: 263901, member: 1375"] No worries. It was an honest mistake. I definitely wasn't trying to call anyone out. :thumbsup: I had remembered talking to Tim at the TS Drags a few years back about the mishap with the engine because of the filter and I thought I had remembered seeing the HPODS installed at that time. I guess the million dollar question is: Can you retrofit the '04.5+ oil rails onto the '03-'04 heads and then change the Valve Covers? Either that, or machine a billet oil rail to match the configuration and porting of the '04.5+ rails, again changing the Valve Covers? Would be an interesting proposition. Now, I agree that without the HPODS there probably is not a HUGE advantage to stepping the pump up on the early engines. I really don't know. That's a question better left to someone like Bob to answer. It may just be that the delivery system on the '03-'04 is more efficient than the later models, allowing the HPOP to work more effectively. Or, maybe it's just that the billet pump is a better overall unit to begin with. In reading the DieselSite page on the billet pump, they indicate several improvements over the factory pump and maybe that's more than enough to make it worthwhile. :shrug: Fortunately, I have an '04.5, so I won't run into these issues. Rest assured though, I will be testing the pressures at the pump and at the head and we're going to see (at least on the '04.5+) just how much of a loss there really is. I've got the sensor and pigtails on order and can monitor the second ICP sensor on my CTS in tandem with the factory one so we can get a live, side by side comparison of the ICP voltages. This will clear the whole thing up pretty quick. :D Not really trying to prove/solve anything. It's really more of a "I wonder what this will do?" type of situation. There is obviously much more going on with the HPO system than meets the eye and I intend to get to the bottom of it and find out, once-and-for-all, exactly what's what. Since we have the ability to not only monitor multiple sensors, but to also high-speed datalog, we can see just how much proximity to the pump affects the sensor or even if changing the sensor location makes any difference in the overall performance of the vehicle (as some have indicated it does). Lots of options to try and test. I'm already making a checklist of test procedures and conditions so that I can make sure not to leave any combination out. Unfortunately, I don't have the cabbage to spring on an HPODS just yet, but definitely have it on the list of goodies for the truck In any event, the next couple weeks are going to be interesting! [/QUOTE]