There are only 2 differences that set the Harley Davidson drivetrain apart from the Lightning. First, and most importantly, the Harley truck features a larger upper blower pulley which accounts for about a 2 psi LOSS in boost against the stock Lightning level. Secondly, the computer is programmed with a richer, and therefore "safer" air/fuel ratio and tune due to the utility nature of the Harley truck. Ford knows that most Harley owners are much more likely to haul loads or tow with these vehicles, so they tuned the computer with a safer air/fuel ratio than that of the lean 13:1 that the Lightning comes with. This really doesn't have much effect on horsepower, it is just mostly for safety, as the boost is the main performance difference. C&L "Stage 2" package consists of our complete 95mm mass airflow and filter assembly with all necessary mounting hardware and a dyno developed tune which is preloaded into our Predator Tuner. This kit is guaranteed to add an average of 25-30 rear wheel horsepower, which is enough to slightly surpass the rear wheel output of a stock Lightning.

Knowing that the Harley F-150 is at a minor disadvantage as far as boost is concerned, our "Stage 3" package consists of the same items as the first kit, but with a 4 psi lower crank boost pulley and correct belt. This gives the Harley truck a total boost level of approximately 2 psi over that of a stock Lightning. Do not confuse this with a Lightning truck that has been fitted with a pulley for 4 MORE psi than stock, as that setup brings you to a level of boost that would require a much lower level of timing if you were to safely tow or use the truck for utitlity purposes. We feel that the level of boost that this pulley gives is ideal for the typical daily driven Harley truck. Raising the boost higher would certainly help the low RPM torque a little in the first gear when you first floor it, but the peak horsepower would not be much better due to the fact that you would have to keep the timing level low for the octane of the fuel and the weight of the vehicle. With the "Stage 3" package installed, the average rear wheel horsepower is increase by 50, with the peak torque and peak horsepower gains coming in at a whopping 75 over stock.