I have a 2000 Pontiac grand prix GTP that's already supercharged can I add an additional supercharger to it.

N O but you can install a larger one, change pulley size for more psi into the engine

Check out ZZPerformance to see what upgrades are available for your car. You don't need a larger supercharger. There is plenty of untapped power in the one you've got. Do your homework first so you know what you're doing and don't waste money on the wrong things or end up with a car that runs worse than it does now.

Put a smaller pulley on the super charger. You should do a few other things first but just do some research

Or just straight pipe it. Then hour supercharger can breathe like it should.... Cheap n easy .... you'll notice a difference

Or just straight pipe it. Then your supercharger can breathe like it should.... Cheap n easy .... you'll notice a difference