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Our Civic EP2 4-1 Tubular Race Exhaust Manifold replaces the restrictive standard cast iron manifold and improves exhaust gas flow thanks to its stainless steel, CAD-designed construction, resulting in much improved throttle response and dyno-proven power gains.Features:Constructed from T304 stainless steel4-1 design73mm Outlet Diameter57mm Branch DiameterTIG weldedImproved throttle response and gas flowFitment:Honda Civic EP2 2000-2005 models.