Optimizes airflow, air density, continuous power MPG. Honors the host vehicle improves longevity. Total Power System for Towing Work. Cut out turbo lag. Increase durability. PickupExcursion Banks Stinger - Plus utilizes Quick - Turbo to cut out turbo lag and strengthen turbo performance. Best gains of 91 hp and 162 lb - ft torque deliver more guts when you need 'em, with 11 percent better fuel economy as you haul a trailer or big load. If you like all that pulling - muscle delivered with a kick, Stinger - Plus is an excellent choice. 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 - Plus Bundle, Power System with Single Exhaust, Chrome or Cerakote Black Tip for use with 1999 Ford 7.3L F250F350, Manual Transmission