The GTD injectors offer more needle lift, as well as possibly bigger holes.
The injection pump is a fixed volume per stroke limited by 10mm head size, then that is regulated down be the control collar. Unless those are changed the additional capacity of a larger injector isn't utilized, and I doubt you'd see much gain beyond what comes from them being new.
The goal is not much more than a D24TIC which uses the same injector as D24t.
I really think with intercooler, free exhaust and some fiddling with fuel screws, you will be there. Some of the 4 banger IDI guys are reaching this level at 25-30 PSI with stock injectors.
As far as I am aware there is no advantage to the D24 lower half, and I will definitely chose the turbo top anytime one is available.
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