JDM S2K speedos will not read over 180km/h even with the speed limiter bypassed:
http://www.s2ki.com/s2000/topic/3725...e-than-180kmh/
http://www.shc-forum.com/viewtopic.p...28cc180c9c5798

as a few examples. I have a feeling that while there may be a few imports running around, there are also more than a few people who are deluding themselves. While I don't believe everything I read on the net, my experience has been that if people who actually have the car (as they were brought into the respective countries) are discussing the issue, there might be some merit to questioning some claims (such as the one in the OP) that the car is JDM.

The 180 speedo setting comes from JAMA and has been in place since the '70s. It's a gentleman's agreement, not legislation but even my old widebody JDM Starion with digital dash (80s tech) had a max speedo reading of 180 as do all skylines, type Rs, S series cars, supras etc etc.