Euro ST turbo upgrade help

I have a 2015 Fiesta ST with 110.000km on it. It has some mods witch are…

- New clutch kit with lighter flywheel from Pumaspeed (They say good for 400hp)
- Qaife diff
- Milltech full exhaust with open downpipe (Sounds great even im soon 50yrs old )
- Open airfilter R-Sport
- Stage 2 IC upgrade
- Pumaspeed Big Brake kit up front
- OZ Racing 17”x7 et25 to clear the brakes
- Coolerworx shifter (amazing upgrade)

Im running a stage 2 from UK but it was before my time. Today im having 240hp in the enigne and goal is 300whp. I want to buy the X48R turbo from Pumaspeed since i live in Norway. Heard good things of the X48R hybrid turbo and want to go “all in” to get a propper trackday car. So i need cooling and handeling parts. But im not shure whats a waist of money and whats going to actualy help.

So what supporting parts shuld i get for power. I assume a new bigger intercooler, maby oilcooler? Coilovers like BC Racing but witch version? Preferably with tuv. What other handling parts is a must have?

If you track it, I would say a radiator and maybe a thermostat to open earlier. Stick with the stage 2 IC for now and later, if intake temps are a problem, upgrade.

You might want to check out the TurboTechnics S280 it’s a really nice Turbo out of the UK that we also got here stateside and it can totally get you into the ballpark of the numbers your after.