How do you know if your grand prix supercharged?

There's no single model called a "Grand Prix Supercharged." Grand Prix was a model name used by Pontiac, and some Grand Prix models *were* offered with supercharged engines, but not all of them. To know if *your* Grand Prix is supercharged, you need to check these things:

* The engine: Look for identifying markings on the engine block itself. A supercharged engine will have specific designations indicating the supercharger. The exact markings will depend on the year and engine type. Your owner's manual will be helpful here.

* The VIN (Vehicle Identification Number): The VIN contains information about the vehicle's specifications, including the engine. Decoding your VIN using an online VIN decoder (many are free) will tell you if a supercharged engine was factory-installed.

* Under the hood: A supercharger is a fairly large component. If you have a supercharged engine, you'll see a noticeable blower or supercharger unit mounted on top of or near the engine. It's usually quite prominent.

* Owner's Manual: The owner's manual should specify the engine type and its specifications, clearly stating if it's supercharged.

Without knowing the year of your Grand Prix, it's impossible to give more specific instructions. If you can provide the year and model, I might be able to give more targeted advice.