The Edelbrock Performer Intake Manifold is optimized to deliver superior performance with square-bore carburettors. Horsepower gains from idle to 5, 500 RPM, when used with Performer Series square-bore or Thunder Series AVS carburettors. Dyno tests show that the power gains an extra 5 horsepower, 9ft/pounds and torque across the entire RPM range over their own performer manifolds. It is optimized to deliver superior performance with square-bore carburettors.