Not useless per se, but the cost of turbocharging a 1.3 is usually a bit steep as compared to swapping the engine itself.

That said, without major work on the internals of the engine, I suppose 120-130hp at around 5-6 psi is realistic for a stock-block 1.3 liter engine. If that's a carburated engine, good luck tuning it for boost. You'll need to upgrade to a bigger carb and a better fuel supply.

What's the 2e? Sprinter? If we're talking FWD Toyotas here, it might be simpler to swap in a 1.3 turbo (110hp stock, tunable for much more). I'm not sure if one exists for RWD Toyota mounts.