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From what I understand the STi's respond well to modding. Doesn't sound impossible it'd gain 20hp and 20tq from an exhaust upgrade.
I've heard of STi's gaining nearly 15-20hp just by running a bit of race gas. Apparently the STi's ECU doesn't like US gasoline, so it dampers the performance... but if you add some race gas to up the octane it senses the change and puts out more power. It might only be for California spec STi's cause we have crappy gas though, else were in the country you can get 93 octane from the pump just about any where.
EDIT: I just noticed you said he'd gain wheel horsepower, not sure about that much of a gain. But maybe crankhorsower... which equate to about... 5-10hp more if he's lucky at the wheels. I'm no expert on the STi, i'm only guessing. I'm sure somebody around here knows.
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