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There is a slight difference on the hawk intercoolers but this does not affect the fitting, As far as i am aware the undertray will only fit the model it was removed from
Just had an 04/05 STI intercooler fitted to my Hawkeye WRX - and there was apparently some slight mods required but nothing major. You need the diffuser/splitter from a Hawkeye STI - the scoop on the Hawkeye STI is the same as the WRX - approximately 75mm high previous STI's were approx 110mm high so do not fit - also the area of the splitter to the intercooler is much larger.
Just had an 04/05 STI intercooler fitted to my Hawkeye WRX - and there was apparently some slight mods required but nothing major. You need the diffuser/splitter from a Hawkeye STI - the scoop on the Hawkeye STI is the same as the WRX - approximately 75mm high previous STI's were approx 110mm high so do not fit - also the area of the splitter to the intercooler is much larger.
Cheers guys - a hawkeye intercooler and splitter then