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The fa20 is the strongest smartest engine Subaru has ever built. The fa20dit in the wrx is lower compression, turbo and uses a less sophisticated injection system.
The ej in the sti is poop and blows up. Fullblown made more hp on a stock fa20 then some built ej's can handle.
There are probably 15 threads on fa20dit swaps. Its worthless. It won't fit. It has a crappy turbo and intercooler and doesn't have the port injections system which I think will be the downfall in 5 years like every other di only car on the market thats been a catastrophe. You will see fa20 4d-s swaps into wrx's I guaranty it.
Fa20s are blowing up from user error or abuse. 400whp on e85 is getting more and more common on a stock engine.
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