Proflows RPM AirMax intake manifold for propular V8 engines features improved technology and design that keeps the air/fuel mixture cooler all the way to the cylinder heads. The open air space from the Air-Gap design separates the runners from the heat of the lifter-valley cover. The runners are tuned to move the power band 1,000 rpm higher over the original Air Duel manifolds—from idle-5,500 rpm up to 1,500-6,500 rpm.