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I'm not an expert by any measure but here are my thoughts:
For injectors: by calculation and including a safety margin you're already running at about the max that your stock injectors can supply. Many more "classical" (non-Saab) hot rodders would tell you that you already don't have any safty margin left. If it were me the first thing I'd do is put a wide band 02 gauge and check to make sure you're not leaning-out at WOT. What really counts is your injector duty cycle so it would be even better if you could somehow measure what's actually happening inside there. After you know what your duty cycle is, you may be able to patch things-up within the ECU adaption capabilities with a good variable pressure fuel regulator.
Clutch: again, if it were me I'd run the old stock setup untill it began to cause a problem that needed to be addressed. Either your clutch is holding or it's slipping. If it's not slipping than it's holding and you don't have a problem yet.
Turbo: like the injectors, you're already at, or very close, to the max flow that a TD04-15T 5cm^2 will efficiently support. Mitsubishi doesn't "officially" publish compressor maps but fakes that I've seen indicate that at the flows you likely have-now you're getting into a very inefficient area of the curve. Which means you're only adding more heat at higher flow rates from here on out. So even if you could supply significantly more fuel, you'd likely have to add a larger turbo to support it.
Before adding more flow capability you want to get an idea what your A/F is now--leaning-out at WOT will very quickly destroy your engine. As a patch you may be able to get some additional duty cyle reserves by bumping your fuel pressure with a variable pressure regulator (and remain within the ECU adaption window) and then go ahead and add more air, but you won't know until you know what you're dealing-with at present.
posted by 67.10.24...
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