HKS Super Turbo Muffler Catback Exhaust - WRX/STI (15-Up)

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Specifically engineered for turbo applications that require greater flow capacity than naturally aspirated applications, Turbo Exhaust systems use a straight through design. The increased flow characteristics offer a gain in boost pressure, boost response, a broader powerband and increases overall peak horsepower. Performance increases vary by application, with average gains of 10-25 horsepower.