[ShaneHobson]

My mistake, not first registered in NZ 1992, imported second hand into NZ after being driven around Japan for several years.
Some of the details are unknown because I bought the car with no registration plates (cheap = parts car).

Just trying to find the chassis number for it.

Are the bulges in the exhaust that the extra sensors fitted into catalytic converters ?

The extra sensors are different from the lower oxygen sensors. Different way of fitting into the exhaust. They are seized in and so haven't removed one yet.

The parts books I have don't show pics of the extra sensors.
I should crawl under my other cars for a look, but suspect I'll have to jack them up to see properly.