He stated that adding injectors, pressure would only help low to mid range power. Any one know if this makes any sense?
True - to a point. The real benefit of stacking a pressure box with the TST is that it allows you to get the same overall amount of fuel, but get it delivered a bit earlier in the combustion cycle. By upping the pressure, and lowering the duration, you get the same (or a little more) power produced, with lower EGT's.
Now, if you had a truck set up so that it could run a TST on 9/9, then adding a pressure box would do little to nothing for your peak HP. However, for street driving, and even 1/4-mile racing to a lesser extent, it's not so much the peak HP, but "area under the curve" - ie. how quickly in the RPM band that HP is made, and maintained. The use of a pressure box will help push that low-to-mid-range curve up.
And, with the addition of properly-designed injectors to optimize fuel delivery, spray patterns, etc. - more power cna be obtained. The guys over at F1 Diesel are toying with 700HP with a combination of a TST, a pressure box, and their injectors.
'05 looks to have the makings of an impressive year
-Tom