Most people who have already upgraded their factory throttle body to a single blade design have reported gains in performance ranging from between 7 to as much as 10 additional horsepower. Flow testing has shown that this arrangement increases airflow through the stock upper manifold by 10.9%. People who already have the single blade throttle body and upgrade to our new intake will see a nearly 20% greater improvement in flow, for a total flow improvement of 29.8 % over the stock throttle body and intake combo.Dyno testing of this intake on multiple vehicles has shown a typical increase of 12-14 HP and as much as 24 ft/lbs of torque when changing the upper manifold by itself. When used in conjunction with a single blade throttle body, gains of between 19-21 HP and as much as 30 ft/lbs of torque are possible. A boost increase of slightly more than 1 additional PSI has been measured, due to the fact that the efficiency of the supercharger is increased through reducing the restriction of airflow entering the inlet of the blower case.This manifold is fully compatible with the Magnum Powers and Kenne Bell upgrade supercharger conversions without any special modifications. Due to the fact that it is possible that the installation this mainifold may change your air/fuel ratio, an adjustment to your computer tune might be necessary to receive the full benefits of this product. This would be most likely on vehicles that currently have an agressive tune. Vehicles with typical bolt-ons and a safe base air/fuel ratio are not likely to require any tuning adjustments.