C&L TRUEFLOW UPPER INTAKE FOR 99-04 LIGHTNING AND 02-04 SUPERCHARGED HARLEY TRUCKS C&L Performance is proud to announce another truly unique and innovative product for owners of 1999-2004 Lightning and 2002-2004 supercharged Harley trucks. This new upper intake manifold replaces the stock unit that delivers air from the throttle body to the inlet of the supercharger. During the development of this item, we found many improvements could be made over the original design. The most obvious of which is the fact that the opening at the blower end is actually smaller than the supercharger inlet. Roots style superchargers are extremely sensitive to restrictions on their inlet, and their actual efficiency can be improved by simply reducing airflow restrictions at the inlet side of the charger. After flow testing this new design, we are happy to report that it has exceeded our expectations. We have supplied a flow diagram below so that you can understand how this new manifold can benefit your particular application. 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. For those people who do not have an upgrade throttle body and would like to upgrade the intake manifold, you will be rewarded with a 14% increase in flow over stock, which is greater than the improvement that people have seen in the past when installing a single blade throttle body. The suggested price for this new intake is $319 which makes it a good value as a bolt-on upgrade. Intake Configuration Flow Rate % Increase Over Stock Stock Plenum/TB 850 CFM Baseline Stock Plenum/Single Blade TB 943 CFM 10.9% Increase C&L Plenum/Stock TB 970 CFM 14% Increase C&L Plenum/Single Blade TB 1103 CFM 29.8% Increase 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.