The long version

In Japan the kei-car tax and parking rules make this the rational choice, not the enthusiast indulgence it becomes the moment it is grey-imported into the US — nobody here gets a registration discount for 63 horsepower, so the import buyer is opting in purely for the driving experience. That self-selection shows: import S660s get autocrossed, canyon-run, and used daily by people who did the import paperwork specifically because they wanted a manual mid-engine roadster and refused to let displacement talk them out of it. It is the smallest car on this index and one of the most honestly used.