No, you can't turbocharge a Pontiac Grand Prix GT in the traditional sense of adding a turbocharger to the existing engine. The factory Grand Prix GTs (depending on the year) came with naturally aspirated V6 engines. While there are aftermarket parts available to significantly modify the engine, adding a turbocharger system is a very complex and expensive undertaking. It requires more than just bolting on a turbo; it involves significant modifications to the engine's internals (pistons, connecting rods, etc.) to handle the increased pressure and power, along with modifications to the fuel system, exhaust system, engine management system (ECU), and potentially the transmission.
Essentially, it's a major engine rebuild and not a simple bolt-on modification. The cost of parts, labor, and tuning would likely far exceed the value of the car. For comparable power gains, other performance upgrades might be more cost-effective.
