Optimizes airflow, air density, continuous power MPG. Honors the host vehicle improves longevity. Stinger energizes performance, efficiency, engine life and adds hefty power at a modest cost. Best gains 32 hp and 42 lb - ft, 5 percent more MPG. Banks stainless - steel Stinger energizes performance and adds substantial power gains at a modest cost. Stinger - enhanced efficiency prolongs engine life and delivers another 32 hp and 42 lb - ft torque to the rear - wheels, plus 5 percent more MPG. Important Some vehicle configurations require an extension kit for proper fit. Motorhome Power. Gasoline Ford 6.8L (V - 10), 1997 - 2002. Test vehicle 1999 Fleetwood Pace Arrow Vision. Description 35 - foot with tag axle. Engine 6.8L Triton V - 10, rated at 275 hp. Transmission 4R100. Rear axle ratio 4.10. Horsepower and torque measured at rear wheels. Vehicle is EGR - equipped (1999 models only) if a large threaded fitting is present on top of second port of driver's side exhaust manifold. Class - C motorhome is Super - Duty (E - 450) if catalytic converter inlet has slip connection. Class - C motorhome is E - 350 if catalytic converter inlet has 3 - bolt flange. Exhaust extension kit required for longer wheelbases. Measure wheelbase length from center front wheel to center drive wheel.