I owned 2 STIs with EJ257's. I have a dozen friends that track and autocross them. I think you're off your rocker. Every one of them have had to rebuild.A stage 2 flex fuel ej257 is awesome as is. And the motor can take it fine. My sister’s did. She swapped her motor into a bug and got a full iag stage 2 motor. Same mods. New tune. She’s waiting on her turbo to get in now.
her husband blew the ej257 on his. But swapped in the wrx fa20. He lost the rumble but gained a lot! He’s gonna build it in the summer