Here's what you're looking at:
* Engine Modifications: The engine's internals (pistons, connecting rods, etc.) aren't necessarily strong enough to handle the increased pressure from a turbocharger. You'll likely need forged internals for reliability.
* Turbocharger Kit: You'll need a custom or aftermarket turbo kit designed for the 3.8L V6, which can be expensive. A universal kit will require significant fabrication and custom work.
* Fuel System Upgrades: The stock fuel system won't be able to supply enough fuel for the boosted engine. You'll need a larger fuel pump, injectors, and potentially a fuel management system (e.g., aftermarket ECU).
* Exhaust System: You'll need a custom exhaust manifold designed to work with the turbocharger and a high-flow exhaust system to handle the increased exhaust flow.
* Intercooler: An intercooler is essential to cool the compressed air before it enters the engine, preventing detonation.
* Tuning: Proper tuning is crucial to prevent engine damage. You'll likely need a custom tune from a professional tuner to adjust the fuel delivery and ignition timing for the boosted engine.
In short, while technically feasible, turbocharging a 1998 Monte Carlo LS is a major project requiring significant mechanical knowledge, fabrication skills, and a considerable financial investment. It's not something a novice mechanic should attempt. If you're not experienced with engine building and tuning, it's best to leave this to professionals.
