Matt Bachand
Depends on the 6.5
Nobody likes a 'nay-sayer'!
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I have done a few Hummer projects in the past one for Diesel Power Magazine and found that the H1 and Van turbos are slightly less effecient than even a GM-4 turbo. Improving pressure to the IP is not a bad way to go if you are turning up the volume of the pump. We are putting a AirDog pump on our project 350hp truck because I have run into fuel delivery issues in the past on the drag strip so we didn't want to take any chances on the dyno. About 15psi is as high as I would go.