* Engine modifications: The engine internals (pistons, connecting rods, etc.) would likely need strengthening to handle the increased stress of forced induction. The stock engine wasn't designed for this.
* Exhaust system modifications: A turbocharger requires a specific exhaust manifold and downpipe.
* Intake system modifications: You'd need a custom intake system capable of delivering the increased air volume.
* Fuel system modifications: The fuel injectors and fuel pump would need to be upgraded to supply the extra fuel needed.
* ECU tuning (Engine Control Unit): The ECU would need to be reprogrammed or replaced with a standalone system to manage the increased boost pressure, fuel delivery, and ignition timing. This is a crucial and potentially complex aspect.
* Cooling system upgrades: The engine will run much hotter under boost, requiring potential upgrades to the radiator, cooling fan, and possibly an intercooler.
* Transmission upgrades: The transmission may also need strengthening to handle the increased power.
The cost of these modifications would likely exceed the value of the Alero itself. Furthermore, finding parts and someone with the expertise to perform the installation would be challenging. It's simply not a cost-effective or realistic modification for that vehicle.