The Australian delivered ones were detuned by about 50HP from the Japanese version by a brass olive inside one of the boost control lines to restrict airflow that would otherwise increase the boost level. I was tempted to try my sisters S15 at Japanese spec boost but common sense overtook me.
Still one of the most enjoyable cars to drive on a twisting road I have ever driven, I didn't buy it when she sold because I hated the driving position. Silly me as it is worth more than triple what she sold it for now because you just can not find unmodified ones any more and it was exceedingly clean, very low KM and completely unmodified.
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