Mechanically, underneath and inside I have no reason to doubt the mileage.
What I do think however is this, based on my Morse like detective skills. The car had a "race crew" sticker on it, you could see the residue when you washed the car. It had the speed limiter cable cut in Japan. The standard ECU has been removed and replaced as a couple of holding down bolts are missing. It's had mods removed before selling, that is obvious (e.g a turbo timer,gauges,an ECU, an exhaust at the very least). The front bumper was sprayed by a piss artist. Basically, I think it's only been used in Japan for racing up and down the Wangan, all the clues point to it. I also think the Japanese owner wasn't as fussed for owning a car in as good a condition as I am, but then neither are most people. I'm very critical because it's my main interest and I take pride in my work.
It was brought into the UK for 6 months where it sat still. You can tell it's been stood, the alloy engine parts have furred up like they do when they've been sat around, the discs were a bit rusty and it just doesn't feel like its been used a lot recently.
Do I think it was worth what I paid almost a month later, no. That's my problem though, nobody can change that so that's that.
Yeah the paint isn't brilliant, but f**k me it's almost 17 years old.
These are the risks you take buying a car from another country. You don't get the import papers, AFAIK they get swallowed up in the registration process.