Originally Posted by kev m
One question - would the manual mate with the 6-cyl? And even if it did, would it stand up to it?
Most subaru engines and transmissions will bolt to each other. There is a 6-speed STI somewhere on the forums with a turbo charged H6 engine.
If I do the manual swap, I would try to find the gearing that I had in my Forester XT. I've seen guys put 300-HP through that trans without any issues.