You will need a Wagon ECU i.e 1C, 3B, V9, V5 or 4B due to the WRX wagon having the smaller TD04 Turbo.
Saloon ECU will not be suitable as it runs the larger TD05 turbo so has different boost control.
Any of these ECU will work, infact most run the same maps but with minor mods to the running code as they matured.
LOL.. wouldn't be suprised if the info above was gleaned from one of my posts many years ago, as I have all these ECU maps/codes on file.
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