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Don't know, I can definitely see a difference in comparison with the 6.5 NA, that's an almost 100hp difference and probably has almost 2x more torque

Does anyone have a part list of what can be done to make our 6.5s the closes to a P400? I know about the forged crankshaft but not sure on everything else

Interesting, makes me wonder how it would do behind the P400 6.5s, unfortunately they're really rare, but I'm still a huge fan of the 6.5s because of how simple they are compared to the duramax and the size compared to the cummins.

I know dead thread, but wouldn't a 6L80e or 6L90e be the best overall modification for better MPG? Overall, you get better ratios and have a .67 overdrive. Even though the 4l80e is a good upgrade from the 3 speed, it still burns a lot of fuel at 65-70 big time and the engine still be screaming...