I've read some things on the Subaru engine conversions (but I'm always
curious to read more, so if anyone has any other links not on
volkswagen.org or relitech, let me know) and was wondering if anyone
knew off the top of their head if the Subaru 2.5 litre engine is
externally the same as the 2.2 litre engine.

2.5 litre, SOHC, 16-valve, 165 hp @ 5,600 rpm, 166 ft-lb torque @ 4,000
rpm versus
2.2 litre, SOHC, 16-valve, 142 hp @ 5,600 rpm, 149 ft-lb torque @ 3,600
rpm versus
2.1 litre wasserleaker, 90 hp, 117 ft-lb torque @ 3200 rpm

My engine is still strong, but I would definitely be up for that sort of
gain in the future!

Keith - 86 Westfalia WBX