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Message: [QUOTE="Chris, post: 235089, member: 400"] I think there are a few things to consider as well. One, anyone who has driven a 6.7, and especially a tuned 6.7 will notice this. The amount of power it makes down low is rediculous. The way it builds torque down low is much greater than even a 7.3. Id imagine cylinder pressures are going to be an issue. Two, Its a pretty known fact the cp4 is very limited when it comes to volume. I have caught wind that if you throw much duration to them at all the pressure will plummet quickly. This gives me an idea that the current tunes available, to get the power gains out of an otherwise stock truck, rely on a pretty good amount of timing advance and allowing the motor to fuel itself even earlier in the rpm range to increase torque, and hence increase hp. Adding larger nozzles to the scenario will multiply this effect. A 6.7 cummins has the same issues compared to a 5.9. granted it doesnt bend rods at 500hp typically, a 6.7 with a quick spooling set of compounds will grenade a few hundred hp lower than a similar equiped 5.9. From the looks of things, the connecting rods are going to be an issue at some point. id be willing to bet once a cp4 can be made to hold pressure at higher volumes, and some cylinder pressure testing is done, and some tuning to take into account larger injectors and heavier fueled engines, youll see the power output grow. We'll learn how to make power at higher rpms so the motors dont destroy themselves down low (just like the 7.3 world went thru) My guess, and thats just it a guess, is these motors wont do the 800-900hp without bending a rod, but id be willing to bet we wont all be worried about them blowing up at 500 either. [/QUOTE]