Affordable Stinger pumps up the volume to level most hills and expedite highway merging. Best gains of +45 hp and +57 lb-ft (rear wheel), and 7% more MPG. Pump up the volume at with Banks' affordable Stinger. Best gains of +45 hp and +57 lb-ft torque levels most hills and expedites highway merging. Pass by more fuel stations with Stinger's 7% mileage improvement. Important: Some vehicle configurations require an extension kit for proper fit. Motorhome Power. Gasoline: Ford 7.5L (460) Class-A, '82-98. Test vehicle: Non-catalytic converter equipped Class-A motorhome. Transmission: Ford E4OD automatic. Weight: 16,650 lbs. Horsepower and torque measured at rear wheels. To determine if catalytic converter is present, look under coach, passenger side. Catalytic converter has 4-bolt flange on its inlet connection to Y-pipe. Chassis manufacturer: This system fits the Ford chassis only, not the John Deere/Oshkosh. Exhaust extension kit required for longer wheelbases (over 178 inch). Measure wheelbase length from center front wheel to center drive wheel