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On a WRX, the claim from Turbo XS is a 45hp gain from a utec (tunable ecu) and resonator removal. Guys on the scooby boards say it's realistically around 20-30hp. Damn, only $650 too.
Some engines have very restrictive management from the start. This is true for the scooby u-tec upgrade, the VW 1.8T, and some other small-displacement factory turbos.