From what i've heard, your going to spend practically the same amount of money doing the turbo setup and doing it right (parts/install/tuning) as the swap considering you can't do it all yourself. If you don't have the $$$ don't try to cut corners, you will regret it i'm sure and end up paying way more than you have to fix your errors.
If you are simply looking for alittle boost in hp and don't have the money to do the swap or turbo, why not look into a nitrous kit. Maybe intake/headers/exhaust/ and a nitrous setup. Do some research on the kits available for your car, its not nearly as dangerous as you might think it is. Many kits run off of computers nowadays and will shut down automatically to avoid bad conditions. Best of luck.
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02 WRX
K&N, ic hoses, up-pipe & turboback