Subaru effectively disabled the 'rev limit fuel resume' logic with the 08 STi. Prior years (and all other models with the 32-bit ECU), will not resume fueling after a rev limit fuel cut until engine speed drops below the low threshold AND boost drops below about 9.7 psig at sea level. With the 08 STi, fueling will resume regardless of boost (only the engine speed threshold comes into play). This seems to be precisely what they are talking about. So, likely the fix is to lower the boost threshold (currently an unobtainable 24 psig at sea level).