The Edelbrock Performer RPM Intake Manifold provides maximum high-RPM power while maintaining good throttle response for street applications. The Performer RPM's are dual-plane, high-rise intakes with a 180 degree firing order to produce incredible top-end horsepower while retaining good throttle response. Their larger plenums and runners match the free-flowing exhaust, high-lift cams and other modifications of a high output engine. They are intended for high-performance street engines that run up to 6, 500 RPM. They are not for emissions equipped engines. The factory composition-type embossed gasket also works satisfactorily. It delivers maximum power with a broad torque curve for high-performance street applications. This manifold has no provisions for exhaust heated or stock-style choke.