To confirm if it's been supercharged, check these things:
* Look under the hood: A supercharger is a fairly large and noticeable piece of equipment. It'll be a noticeable device bolted onto the engine, usually sitting on top or near the front of the engine. It'll have belts running to it from the engine's crankshaft.
* Listen to the engine: A supercharged engine will have a distinct whine or whistle, especially when accelerating. This is the sound of the supercharger forcing air into the engine. It's a much higher-pitched sound than a naturally aspirated engine.
* Check for modifications: Look for other modifications that often accompany a supercharger installation, such as:
* Larger intercooler: Often found near the front of the car.
* Upgraded fuel system: Larger fuel injectors or a fuel pump upgrade would be needed to support the increased air intake.
* Modified exhaust system: A performance exhaust is often installed to handle the increased power.
* Engine management system modifications (ECU tuning): This is essential for a supercharger to work correctly. You might see evidence of this through aftermarket tuning chips or software.
* Check the paperwork: If you have any service records or purchase documentation for the car, it might mention the supercharger installation.
If you don't see any of these signs, it's highly unlikely your 1999 Grand Prix GT has a factory or aftermarket supercharger.
