The Subaru Vivio is classified in Japan as a "Kei" (k) car. This category has strict rules on the size of the car, from the body right down to the engine and power output. Although there are a variety of k-cars that are turbo or supercharged, their maximum output allowed by Japanese law is 64 hp. The normally-aspirated Vivio gives out 52 hp, but with a little modification, it is not difficult to raise this figure a little.

As common with Japanese cars, higher end models of the Vivio are packed with features, including:

• 16V DOHC Supercharged engine
• 6 speed transmission
• 4 wheel drive
• Factory bodykit and sports wheels
• Sports interior
• Power windows and central locking

As quoted by Subaru Italy, "despite the moderate exterior size the 5 door Vivio is a remarkable, comfortable car, thanks to the functional utilization of the inside space...the 4WD system can be activated at any speed by simply pressing a button on the gear lever."