Hi,
No matter what, there will be things that need to be changed, but there is a chance it will work.
However, I need to know the model of the 2001. The 2001 Legacy didn't have a 2.2L. It only came with the 2.5L. On the other hand, the 1999 came with a 2.2L. By chance, did you mix them up? I don't think the 2.2L was offered in 2001.
Let me know. Also, the engine will be a nightmare to change. Mounts, modules/computers, wiring harnesses, vacuum harnesses, and so on will all need to be changed. It's not a simple undertaking. The transmission will also require changes but may be a bit easier because it is a manual transmission.
Let me know.
Joe
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Monday, April 24th, 2023 AT 8:09 PM