* Engine Compatibility: The Lumina's engines (likely a 3.1L V6 or a 3.4L V6) weren't designed for forced induction. This means you'll need significant modifications to the engine's internals (pistons, connecting rods, possibly crankshaft) to handle the increased stress and pressure from the turbocharger. The stock internals are not robust enough.
* Fabrication and Custom Work: You'll need custom fabrication for the turbocharger manifold, downpipe, intercooler piping, and possibly oil and coolant lines. Finding pre-made kits for this specific application is highly unlikely.
* Tuning and Management: You'll absolutely need a custom tune for the engine management system (ECM) to properly control fuel delivery and ignition timing with the turbocharger. Running a turbocharged engine without proper tuning can lead to engine damage or failure.
* Cost: The cost of parts, fabrication, and professional tuning will likely exceed the value of the car, unless you're doing most of the work yourself and possess the necessary skills.
In short, while technically feasible, it's a very complex and expensive project requiring significant mechanical expertise and fabrication skills. It's far from a simple bolt-on modification. For most people, it wouldn't be a worthwhile endeavor. It's usually more cost-effective to simply buy a different car that already has a turbocharged engine.