Here's the breakdown:
Challenges:
* Engine Management: The 2002 WRX engine uses a different ECU and wiring harness than the 2000 RS. You'll need to either find a compatible ECU or get a standalone engine management system.
* Transmission: The WRX engine is designed for a 5-speed or 6-speed transmission, while the 2000 RS has a 4-speed. You'll likely need to source a WRX transmission.
* Exhaust System: The WRX exhaust is different, and you'll likely need a new one.
* Cooling System: The WRX engine may have a different cooling system, requiring changes.
* Wiring: You'll need to adapt the WRX wiring harness to your 2000 RS.
Things to Consider:
* Cost: This is not a cheap project. Expect significant costs for parts, labor, and potentially engine management.
* Skill Level: This is an advanced project. You'll need a good understanding of engine mechanics, wiring, and potentially custom fabrication.
* Time: This is a time-consuming project. It can take weeks or months to complete.
Alternatives:
* Engine Rebuild: Instead of a swap, you could rebuild the 2.5 RS engine with WRX internals, giving you a more powerful engine without the complexities of a swap.
* Supercharger: You could add a supercharger to your existing 2.5 RS engine, providing a significant power increase without a full swap.
If you are determined to do the swap, it's highly recommended to research the process extensively and seek guidance from experienced professionals. This will help you avoid costly mistakes and ensure the project's success.
