Edelbrock Performer RPM intake manifolds have a high-rise, dual-plane design. They produce incredible top-end horsepower, while retaining good throttle response. Performer RPMs have larger plenums and runners to match the free-flowing exhaust, high-lift cams, and other modifications of a high-output engine. They're intended for high performance street or competition engines that run from 1,500 to 6,500 rpm.