* Engine Code: The specific engine code (found on the engine itself) is crucial. Even though both are 2.7L, there might be internal differences (e.g., different pistons, crankshaft, etc.) that affect compatibility with the 2003's engine management system (ECM).
* Engine Mounts: The engine mounts may not be identical, requiring modification or replacement.
* Wiring Harness and ECM: The 2000 and 2003 models likely have different wiring harnesses and ECMs. You'd need to ensure compatibility or perform extensive wiring modifications, potentially requiring a custom harness.
* Transmission: Ensure the transmission from the 2000 model is compatible with the 2003 engine and mounts correctly.
* Exhaust System: The exhaust system may not be directly compatible.
In short, while it *might* be possible with significant modifications and potentially a professional mechanic's help, it's not a straightforward swap. You'd need to compare the engine codes and meticulously check for compatibility across all the above-mentioned systems before even attempting it. It's highly recommended to consult repair manuals for both the 2000 and 2003 Intrepids to assess the feasibility. The effort and cost involved might outweigh the benefits of the swap. Finding a used 2.7L engine from a 2003 Intrepid would be a much simpler and more reliable solution.
