Wallew, I'm not trying bring this back up to show you up, so please don't take it that way. I have ran, built, and modified these engines for years. Having lots of experience with these engines, I can tell you with certainty that getting 100HP with just injector tips is impossible, and I will tell you why. The problem is, was, and always will be heat on these engines. Being an indirect injection diesel, that is the limiting factor on these engines. The marine spec engines can and are built to produce much higher HP levels than they ever can in a truck simply because there is a whole lake to keep them cool. For years, I've pushed the envelope on them and I have always "hit the wall" when I could no longer keep them cool. The EGT's of a 6.2 getting enough fuel to produce 250HP without a turbo would be astronomical. In fact, getting to 250HP WITH a turbo requires quite a bit of modification to make it live. There has been many a 6.5TD truck that had the turbo go bad, and the engine was destroyed by due to the owner not parking the truck.
For all around performance (not max power by any means, but affordable, reliable power), these engines are about at their best with the CR lowered to 19 - 19.5 : 1, an efficient turbo like A Team turbo, and 4911 6.5TD mechanical IP, 6.5 injectors, 6.5 haeds with the larger diamond precups, a J code turbo intake, and the 1997 up dual stat water crossover, high flow water pump, and a D max fan (this requires serpentine set-up). You can drop the CR to 18, but they have cranking issues in cold weather climates. I built a 6.2 to these specs (except I used a Holset H1C turbo from a first gen Cummins) in a '91 C3500 service body truck I had, and it was very impressive. It cranked well when cold, and ran very strong even when hauling heavy equipment trailers. The EGT's and temp were much easier to keep in check the stock CR 6.2's I've built. I did have to put a jumper wire to GP controller when it was really cold. It needed a little more glow time that the stock controller provided and I used Delco 60G's to keep from overheating them.
One more, thing I gotta share from racing days is flow dynamics. As crazy, as it sounds, a single 3" pipe does out flow dual 2" pipes. Its one of those weird things, but flow dynamics don't lie.
single 3" pipe:
3.14*1.5*1.5 = 7.065 in^2
dual 2" pipes:
2*3.14*1*1 = 6.28 in^2
Not only does the 3" have more cross sectional area, but there is more flow resistance with the 2 pipes than there is with one. When I was first told this years ago, I argued that the guy was crazy. After extensive research, I realized I was wrong. I was racing an 80's Camaro and they have no easy provision for dual exhaust. I was tossing ideas around to modify the floor of the car to run duals, and I was wasting my time. I ended up running a single 4" system and the car ran ran in the low 10's at 140+.