Speaking from personal experience and now having a built engine (by
FullBlown ) it would be extremely wise to build your whole short block if you plan on doing any internals.
My first turbo on this car was a Greddy running E85 and pushing about 11-14psi. After 600miles of having my turbo on one of my rods broke and perfectly punched a hole through my short block. My tune at the time was pushing 300whp. It's kind of a pain in the a$$ shopping for a new short block (ended up buying a whole engine for a good deal). This might not happen to you since there are a lot of people pushing 14psi (E85) and not having any issues with stock. But honestly, these stock rods are garbage. I've talked to a few Subaru techs and they didn't seem to be too impressed when they did an analysis of my blown engine (since Toyota wouldn't touch the damn thing lol).
My new build is a 10.0:1 compression ratio built short block with Full Blown 1000hp rods. I also decided to go with Full Blown's turbo kit because of the flexibility. The car is a beast now and not too much lag from the 12.5:1. I'm pushing 18psi (E85) right now with just over 400whp and still have more room for play. I'm really happy with how LJ at
FullBlown did on the car. I would shoot them a message for sure on your engine. They have some good options and knowledgable people.
Hope this helps!!
