Cars are known by their codes
This is the defining quirk of the culture. Enthusiasts identify these cars by internal chassis designations rather than by the names they were sold under, and in several cases the code is far better known than the model name it refers to.
One small coupe in particular is known almost exclusively by its code, largely because of a manga and anime series built around it, to the point where many fans would struggle to name the model it actually belongs to.