* Condition of the car: A well-maintained car with proper tuning will run significantly faster than one that's neglected or modified poorly.
* Driver skill: A skilled driver will achieve a better time than a novice.
* Track conditions: Temperature, humidity, and altitude all affect performance.
* Modifications: Any aftermarket parts (intake, exhaust, tune, etc.) will impact the quarter-mile time.
While a stock 1999 Pontiac Grand Prix GTP supercharged might run in the low to mid 14-second range, a well-maintained and possibly slightly modified car could achieve times in the high 13-second range. However, heavily modified cars could go considerably faster.
To get a precise estimate for a *specific* car, you'd need to know its condition, modifications, and the conditions under which it was tested. You won't find a definitive answer without that information.
