Stock rated power was 230 Hp for the WRX and 293 Hp for the STi ('06 - '07).
A turbo upgrade requires fuel system upgrades and an engine tune as well, which means upgraded injectors and fuel pump.
An STi has better heads and cams as well as a bigger turbo, but 300 Hp out of the WRX 2.5L is achievable with the right turbo and without internal engine mods.
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