The main differences between the STi and the LGT motors is the intake manifold, intercooler, turbo and throttle body. All bolt on stuff, really.
Since the rest of the long block is essentially the same, I think it would cost as much to buy from Subaru.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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