The Booster Car Prototype is a vehicle owned by the KG Death Bots in Jak 3. It can be found in the KG War Factory, and plays a big role in completing it's mission.
Red and blocky with a black grill on the front.
The car allows you to break through walls in the KG War Factory. This lets you pass to the Section containing Cyber Errol. Also it is used to break the Hover Bot spawning devices.
It was probably supposed to be used by UR-86 to help advance the KG Death Bots in the War for Haven City.
It's not extremely powerful, fast and nor does it have a jump. It's secret lies in the infinite Booster which it can use to crush major objects like walls with ease.
It can be found halfway through the War Factory, on a small platform.