The RPM manifold is way better below 2500 RPM than any single plane intake is, especially in 3rd or 4th gear when you need part throttle pulling torque In all truthfullness though I've never dyno tested or ran a Holley Street Dominator intake on any motor or cars I've owned or driven so keep that in mind please I bought a 440 one once but is was so ugly looking I sold it before getting up enough guts to try it