You've probably noticed I have a thing for complex miniaturization - hence my appreciation of the Alto Works. Here's the numbers: 660 cc, 3 cylinders, 2 cams, 12 valves, 1 turbocharger, 8,500 RPM, 4 wheel drive, 670 kg. Being a Kei car, they were legally limited to 64 PS (63 HP), but are easily tuned to nearly 200 HP without internal modification.
Check out this guy's write-up on a 175 HP FWD example he used to own. Also impressive is this sub six second 0-100 km/h speedometer video.