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So this weekend my cousin got a m923a2, so i met up with him to check it out. it was idleing a bit low so i turned that up for him and i went to turn up the top screw like i did to mine and got no results... i turned the screw on my truck about 2 3/4 turns and is a coal blowing monster and i did...

Don't wast money on injectors. They most likely wouldn't change anything unless you turned up the pump. I'm sure you could achieve 500+hp with stock injectors. And the allison wouldn't like that...

This is my truck with just the top screw turned out 2 3/4 turns and 6" exhaust. https://www.youtube.com/watch?v=otGAPRUsxR0

The cheapest way to make the most HP on a P7100 is to take the plate out! haha

Ok! So I just picked up my m923a2 last Monday and just turned the fuel up today and I can't believe the results!!! I have to tell ya I'm a big 5.9 12 valve cummins guy and this just tops it all! There's no replacement for displacement! Unless you have an 855 cummins, then you just have a boat...