Optimizes airflow, air density, continuous power MPG. Honors the host vehicle improves longevity. Total Power System for Towing Work. (1999 - 2004 6.8L) An economical alternative to the PowerPack, Stinger works hard and plays hard. Rear - wheel gains up to 35 hp and 42 lb - ft, up to 5 percent more MPG. 1999 - 2004 6.8L Super Duty Pickup Banks Stinger is an economical alternative to the PowerPack, producing rear - wheel gains to 35 hp, 42 lb - ft torque and 5 percent better mileage. Hauling a payload or big toy Stinger has the substance to tackle many heavy - duty jobs, and makes play - time a lot more fun, too. Gasoline 6.8L (V - 10), 1999 - 2005. Test vehicle 1999 Ford F - 350 crew cab dually, 6.8L Triton V - 10, 4R100 4 - speed automatic, 4.10 rear axle ratio, 7500 lbs solo weight, 20,000 lbs combined towing weight. Horsepower and torque measured at rear wheels. Systems do not fit 2005 (3 - valve) vehicles designated by a V in the 8th position of the VIN number.