Btw, I haven't really found a site as good as SAU, SDU or GTROCUK in Japanese... as far as I know clubs/message boards are divided down into prefectures so that only locals tend to read your message... not like a national thing.
The other thing I noticed was that with SAU etc, it's a nationl/international family of enthusiasts, whereas in Japan you get all sorts, not necesarily guys that know what they're talking about... more like they got a Skyline so they could be part of a club or something??? Now I'm talking about Japanese social issues... a little OT.
But anyways mate thats just what experiences I've had.