Pump up Ford Class-A muscle and attack hills with a lot less shifting! Top gains: +85 hp and +118 lb-ft (rear wheel), and 12 percent more MPG. Improves engine durability. Banks' stainless-steel PowerPack pumps up Ford Class-A muscle with top gains of +85 hp and +118 lb-ft torque and 12 percent better mileage. PowerPack features Banks' bulletproof TorqueTubes (the industry's only tuned exhaust manifolds built expressly for motorhomes) for low-end torque to take on hills with strength, speed and less shifting. Because your coach is unencumbered by factory restrictions, you'll enjoy top performance and longer engine life. Chassis manufacturer: Ford. 7/8 inch hex front-wheel lug nuts. John Deere/Oshkosh: 1-1/2 inch hex front-wheel lug nuts. Important: Some vehicle configurations require an extension kit for proper fit. Fitment Notes: 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. Exhaust extension kit required for longer wheelbases (over 178 inch). Measure wheelbase length from center front wheel to center drive wheel. Key Features: Top gains: +85 hp and +118 lb-ft (rear wheel), and 12 percent more MPG Optimizes airflow, air density, continuous power and MPG Honors the host vehicle and improves longevity Attack hills with a lot less shifting CHROME tip US Patent #6,634,171 B1 50 State Compliant CARB E.O. D-161-112, D-161-80, D-161-45