I've never seen a skyline in the country, they are very rare. If it was right side drive, then it's a possibility, but you can be assured its not if it was left side drive.
And about the japaneese under rating their cars, yes. Its funny the things they do to pass. Skylines have had systems where they have an easilly acessable "plug" installed from the factory. It takes like 40 or so hp out of the fuel/timing curve so that it can pass the jap standards. All the user has to do is remove this plug, or flip a switch and unleash the power.
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'90 Eclipse GS Turbo