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Fabspeed Porsche 997 GT3 / GT3 RS Long Tube Competition Race Header System (2006-2009) Exhausts HJS GErman catalytic converters akaDesigned for racing, track events and off road use, Fabspeed's Long Tube Competition Race Headers with integral Side Muffler Bypass Pipes are designed to maximize the horsepower and torque bolt on potential of the Porsche 997 GT3 GT3RS engine by increasing exhaust flow from the engine cylinders straight into the exhaust system. This system was designed, incrementally dyno developed and maximizes engine power all throughout the powerband. When the