* Gear ratios: The final drive ratio and transmission gearing heavily influence how fast the car can go at a given engine RPM.
* Aerodynamics: Air resistance increases dramatically at higher speeds, limiting the maximum attainable velocity.
* Engine power and torque: The engine's output determines how much force can be applied to overcome aerodynamic drag.
* Tire condition and size: Worn or under-inflated tires reduce traction and handling stability at high speeds.
* Road conditions: Headwinds, inclines, and road surface affect top speed.
While a 1999 Grand Prix GTP is capable of respectable speeds, removing the rev limiter doesn't automatically unlock a significantly higher top speed. The engine might simply reach its horsepower limits and run out of steam well before hitting a theoretical maximum speed determined by purely aerodynamic constraints. You'd likely see a relatively small increase in top speed (perhaps 5-10 mph), but the risk of engine damage is substantially increased without the limiter's protection. In short, exceeding the design limits of the car is dangerous and counterproductive. Attempting this on public roads is also illegal and extremely hazardous.
