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If I'm reading that spec sheet right the boost is 33.4 PSI

I'm not defending their claims but I don't know what base MPG they were getting before injection. From my reading it looks like you can increase injected quantities up to a point and you get quench which is not destructive it just causes loss in power.

more digging turns up the dodge duramax 6.6 is a very similar engine from what I am reading. It runs 22-24 psi stock. With software mods 26-30. Block can handle 45.

ok after some digging the turbo part number is: 4R9147 . This may make it possible to get the numbers.

Posts on the 3126 people are reporting 30-35 psi at max load uphill. Cat can read your engine serial and tell you what boost it's set to.

I just contacted banks. They recommend their kit. Looks like Snowperformance also has a kit. Also found videos and links to GMC topkick tuners that run these systems. From all that research it looks pretty common. It also looks fairly safe because it does not change the timing at all. If you...