You could probably turbo it with low (very low) amounts of boost without doing anything else to the motor.
But if you wanted decent boost/power, you'd probably have to add forged internals and maybe get some STi heads.
By that point, you're probably pretty close to what a swap would cost.
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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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