* Specific modifications: Has the car been modified in any way (engine, exhaust, etc.)? Modifications significantly impact top speed.
* Condition of the car: A well-maintained car will perform better than one that's neglected.
* Gear ratios: The gearing in the transmission will affect the car's speed in each gear.
* Aerodynamics: While not a huge factor at lower speeds, it does become more relevant at higher speeds.
* External factors: Wind, road conditions, and even altitude can affect top speed.
Without any modifications, a stock 2000 Mustang GT is generally considered to have a top speed in the range of 130-140 mph. However, this is a theoretical top speed under ideal conditions. Reaching this speed on public roads is extremely dangerous and illegal.
Keep in mind that this is just an estimate. For a precise top speed for a *specific* 2000 Mustang GT, you'd need to know its exact condition and any modifications it has received.