* The kit car itself: Different kits are designed for different performance levels. Some are designed for leisurely cruising, while others are built for high speeds. The base design dictates the aerodynamics, chassis strength, and potential engine compatibility.
* The engine: The most significant factor. A small, low-power engine will result in a much lower top speed than a powerful, high-performance engine. Kit cars can be built with a wide range of engines, from relatively small four-cylinders to large V8s or even highly tuned engines.
* The modifications: Even within a specific kit car model, modifications like upgraded suspension, tires, aerodynamics, and engine tuning will drastically affect top speed.
* Driver skill and conditions: Even with a powerful car, driver skill and external factors like road conditions and weather will impact the achievable speed.
In short, a kit car could theoretically reach speeds over 200 mph with a powerful enough engine and extensive modifications, but many kit cars are built with much more modest performance goals and will have considerably lower top speeds, perhaps in the range of 80-120 mph. It's highly dependent on the specific build.
