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IIRC, the engine needs to be detuned some because the UK and the US do not have high enough octane for the engine to make 280 HP. Which is only the number they put on the car because of the "limit" established by the JDM car manufacturers for cars they sell in the JDM. Most things I have read about the JDM STi figure the car is closer to 310 HP.
 
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