Optimizes airflow, air density, continuous power MPG. Honors the host vehicle improves longevity. Total Power System for Towing Work. Budget - minded Stinger's upgrades reshape the fuel curve to match the improved airflow. With top gains of up to 68 hp and 128 lb - ft (rear wheel), 10 percent more towing MPG and longer engine life. Banks OttoMind engine calibration module reshapes the fuel curve to match the improved airflow, to give you a more efficient engine that optimizes power right up to the shift points. Test vehicle 1999 F - 350 crew cab dually, 2 - wheel drive, 4R100 4 - speed automatic trans. Towing combined vehicle weight 20,000 lbs. Horsepower and torque measured at rear wheels. Fitment Notes Some vehicle configurations require an extension kit for proper fit. 1999 Power Stroke variations Ford trucks for model year 1999 fall into three categories 1999, early 1999.5 and late 1999.5. It is important to know the specific model. Check the build date on the tag inside the driver's door, then match 1999 model year (built prior to 199 with catalytic converter), Early 1999.5 model year (built prior to 199, no catalytic converter, intake manifold has 2 inch - diameter inlets), Late 1999.5 model year (built on or after 199, no catalytic converter, intake manifold has 3 inch - diameter inlets). 1999 - 2003 F - 350 cab - and - chassis (no bed) trucks If fuel tank is behind rear axle of the vehicle, use systems for F - 450550 trucks. Pickups other than standard - cab long - bed or extended - cab short - bed require Exhaust Extension Kit. Stinger not available for 2001 - 2003 (275 hp) pickups. Stinger Bundle, Power System with Single Exit Exhaust, Chrome or Cerakote Black Tip for use with 1999 Ford 7.3L F250F350, Automatic or Manual Transmission