Hi Jamie
I have also read that after 1995 its straight OBDII, I am assuming you are not in the UK as I am sure I read that on one of the US Forums and it may be that the JDM cars are different to the Strateside vehicles.
The Bluetooth I have is a ELM327 For the Torque app and the stand alone reader is a ProScan V350 as I say my Car being a Grey Import to the UK is Japanese Domestic Market product so this may have a bearing on the compatibility, also there is no way of knowing if anything has been modified in that area of the car as there have been previous owners in the UK and probably in Japan also but I unfortunately have no history with my car.
When JDM cars are imported into the UK they all get modified to a greater or lesser extent to comply with the UK regulations. This generally amounts to The fitting of a Red rear fog light with switch and warning light and the front side lights being changed from Amber to White as a minimum.
In my experience these modifications are carried out to a very poor standard simply to allow the vehicle to obtain a Ministry of Transport Test certificate to enable the importer to sell the vehicle, and there is no telling what wires have been sliced into to obtain Feeds and Earths.
Please keep in touch if you get a unit to communicate with your car as I would be very interested in being able to use a OBDII
Best Regards
Marc