K&N 77 Series Air Intake System 5.4L F-150 2004-2008

See up to 9.55 horsepower gains at 3724 RPM in your 2004-2008 F-150 using this air intake system (77-2556KP). A powerful replacement for the factory air filter and intake tube, this K&N system works like a charm on 5.4L engines. Using tubing mandrel bent from aluminum, it achieves the horsepower gains while simultaneously improving torque. A cotton filter element then provides longevity, requiring cleaning every 100,000 miles under normal highway conditions. Since the filter is washable as well, it makes maintenance simple.

Features and Benefits:
- Replaces factory air filter & intake tube
- 9.55 estimated horsepower gains @ 3724 RPM
- Increases torque
- Intake tube mandrel bent from aluminum
- Bright, mirrored finish
- Red, cotton gauze air filter element
- Filter requires cleaning every 100,000 miles
- Includes 9 stainless steel clamps

Vehicle Fitment:
- 2004-2008 Ford F-150
- For models with a 5.4L engine ONLY

Tech Tip: Whenever the filter element needs to be replaced, you can find a replacement under K&N P/N: RU-5046.