Can you put a Cobalt 2.0 turbo engine in 2002 Sunfire?

No, you can't directly put a Cobalt 2.0L turbo engine into a 2002 Sunfire without significant modifications, and likely not in a practical or cost-effective way. The engine bay, mounting points, wiring harness, and computer systems are completely different between the two cars. It would require extensive fabrication, custom wiring, and potentially a custom ECU (Engine Control Unit) reprogramming. The cost and effort involved would far exceed the value of the resulting vehicle.