No Longer Available - K&N Air Intake 77 Series for 1997-2008 Ford F-150/F-250

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Adding an aftermarket intake system to your Ford is one of the easiest and most cost effective ways to increase you trucks horsepower and torque. A 77 series K&N intake system will allow your engine to breathe easier resulting in more power. Better airflow means increased performance and better fuel economy. Another important feature of the 77 series intake in the washable filter. This allows the filter to be used over and over again without needing to buy a new one every time which is necessary when using paper filters. If your looking to add power to your Ford, and get better gas mileage, a K&N 77 series intake is for you.

77 Series Intake Benefits

  • Increase in horsepower and torque
  • Better throttle response
  • Reusable filter. No more buying paper air filters
  • Increase in fuel economy
  • Custom, aggressive look in your engine bay
  • Deepens your exhaust tone
  • One Million mile K&N warranty

Dyno Charts

1998 Ford F-150 4.2L - 6.15 Hp Gain

2001 Ford F-150 5.4L - 9.38 Hp Gain

2006 Ford F-150 4.6L - 7.68 Hp Gain


Car Fitments Model Estimated Horsepower Gain Replacement Filter Weight Length Width Height
1997-2004 Ford F-150 4.2L V6 77-2550KP 6.15 HP @ 4567 RPM RC-5107 9.9 lb 23 in. 14.38 in. 12.25 in.
1997-2003 Ford F-150 4.6L/5.4L V8 +1997-1998 4.6L/5.4L F-250 77-2514KP 9.38 HP @ 4093 RPM RC-5046 12.1 lb 19.13 in. 18.25 in. 12.25 in.
2004-2005 Ford F-150 4.6L V8 77-2557KP 9.31 HP @ 4724 RPM RF-1020 12.7 lb 19.13 in. 18.25 in. 12.25 in.
2004-2008 Ford F-150 5.4L V8 77-2556KP 9.53 HP @ 3725 RPM RC-5046 11.3 lb 19.13 in. 18.25 in. 12.25 in.
2006 Ford F-150 4.6L V8 77-2569KP 7.68 HP @ 4775 RPM RF-1041 12.4 lb 23 in. 14.38 in. 12.25 in.

(77-2556KP pictured)


  • Typically can be installed in under 90 minutes
  • Doesn't require any special tools

Install Guides

1999-2004 Ford F-150 4.2L V6 (77-2550KP)

1997-2003 Ford F-150 4.6L/5.4L V8 +1997-1999 F-250 4.6L/5.4L V8 (77-2514KP)

2004-2005 Ford F-150 4.6L V8 (77-2557KP)

2004-2008 Ford F-150 5.4L (77-2556KP)

2006 Ford F-150 4.6L (77-2569KP)

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