I am going through this process at the moment - gathering bits to go from the PPP WRX to about 320-330 bhp. Bits I'm getting together:
New panel filter (I went with Green)
VF35 turbo (VF34, VF43 or TF05-16g also supposed to be fine)
Cat-less up pipe
Sports cat down pipe (I'm getting a PPP one from an STI)
Pink injectors
STI TMIC (although I was told that the WRX would probably cope fine) - FMIC is overkill for the power the WRX engine and gearbox can cope with
I also got an oil catch can, and of course it will need a remap.
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JDM twinscroll Legacy wagon [previously blob WRX/PPP wagon, killed @ Silverstone Feb 2019]
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