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[I guess the different ECUs, slightly higher compression and better header have nothing to do with the 2 crank hp difference.. it must be that higher octane gas this whole time. ]


yeah the only reason the motor's better tuned in japan is cause of the octane level difference from usdm type R's .. better gas allows them to make a healthy running motor with more compression, requiring new fuel maps (which is why u got another ecu for) and a better flowing (2.5" piping).