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the piston rings. a factory subaru rod is pretty damn strong, for them to fail is very rare.
it's always the piston rings....or the heads will lift, since the motor wasn't designed for the boost.
but what do we know, subaru may have built this thing strong as hell knowing that they failed with the sti's stock block on later models and knowing the aftermarket world was going to turbo the poop out of the car.
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