Kei car (or keijidōsha, 軽自動車) "light automobile", known variously outside Japan as Japanese city car, ultramini, or Japanese microcar, is the Japanese vehicle category for the smallest highway-legal passenger cars. Usually the engine size less than 660 CC.
With the development and popularisation of kei cars in Japan movement for tuning of Kei cars has started.
Following are some tuning ideas.