So, with it being a few months now with numerous cars on the roads pushing extra power from remaps and such, let's consolidate results and what you can expect based on where you are.
The mods that make power are obvious across Europe and from, intake and intercooler, exhaust bits are better for torque and boost holding towards redline.
UK: not many tuners for hyundai out here and a lot of companies just intermittently working on these cars but average results are as follows
"Stage 1" (stock car, remap) - 230-240hp, 360-400nm
"Stage 2" (intake, IC, etc.) -245-255hp, 380-410nm
Germany: seems like the best place to be because you can access 102 fuel which can add up to 10hp and numerous HYUNDAI tuners that love these
"Stage 1" - 235-250hp, 370-410nm (102 fuel)
"Stage 2" - 250-270hp, 400-420nm (102 fuel)
Italy: again, 1 big tuner that's been working on these cars and 100RON fuel available
"Stage 1" - 235-240hp, 360-390nm
"Stage 2" - 245-260hp, 390-410nm
Few "stage 3" hybrid turbo cars across the world too, results seem to be about 290-320hp, 400+nm with the courtenay sport test car being notable at 304hp, 410nm on 99 RON and nearly 320hp, 430nm on 102 RON. claims have come out of AUS about cars hitting 330hp but I'm not sure about that one.
The main talking point about big power cars is engine component longevity, the big one being piston rods. obviously there'll be more info and data to come for a time period likely as long as we've waited for this car to be mappable but for now your varying scenarios will likely lead to above results and depending on where you take your car, some tuners will prioritise longevity over numbers and others will give you everything they can without causing damage. The turbo is still a limiter in the "stock" tuning process and it's hard to get it to hold much more than 1.1 bar at redline, but it's not as bad as originally presumed, 102 RON cars at a push in germany hitting high 260's-270hp on intake and intercooler.
Hope this is comprehensive enough lol