@kent01 I disagree with you there, 6.9 definitely needs studs for even 10-15 psi of boost in my opinion. they have 7/16'' head fasteners that are much weaker than the 7.3's 1/2'' fasteners. A stock turbo ip with a factory turbo or banks turbo will push 15 psi fairly easily. So right there you are in the territory for needing head studs on a 7.3 idi with at most turning up the pump. No lowering compression, nothing. It does not take much more work to get to 250 hp. granted that is some money spent, but not like you are talking. You could go about it one of two ways, a 110 pump or bigger on a banks or factory turbo will put you close as macrobb has shown, or you could intercool, bigger pump, and turbo, and bam you are there. It is also pretty dang reliable to do it the latter way. the only thing with doing either of those you need head studs to get to that mark otherwise it isnt horrendously difficult to hit 250whp in an idi.