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Headers with 200 Cell Race Cats High quality T304 Stainless steel equal length primary tubes. C.N.C. mandrel bent, computer numerical controlled mandrel bending equipment. Designed for maximum flow and no restriction. Headers come with 200 cell German imported sport race catalytic converters. Reduced back pressure and better scavenging. More torque and horsepower across the RPM band. High velocity merge collectors for maximum scavenging and performance. More power & torque across the RPM band.Fits:Porsche 997 GT3 / GT3RS 2007>>