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K&N 77-2585KS Air Intake

Intake Kits > Performance Intake Kit
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   7 Customer Reviews
  • Guaranteed to increase horsepower
  • Designed to improve throttle response and engine sound
  • Free-flowing aluminum tube
  • Replaces entire factory air intake system
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Easy to install, usually in 90 minutes or less
  • Washable and reusable lifetime air filter
  • K&N Million Mile Limited Warranty
The K&N 77-2585KS high-flow performance air intake system is a free-flowing, mandrel-bent aluminum tube air induction system designed to fit some Ford F150 models. The restrictive factory air filter and air intake housing on your vehicle are replaced by this K&N air intake system which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow. The improved air flow allows your engine to inhale a larger amount of air than it would from the stock air intake. More air means more usable power and acceleration throughout your engine’s RPM range. The 77-2585KS air intake comes with a chrome topped K&N high-flow air filter and a heat shield that installs onto the lower airbox. Air is directed through the intake tube into the engine’s throttle body for a guaranteed power gain. The intake tube has an attractive silver powder-coat finish that's made to last and it accommodates the factory mass air sensor, EVAP vent line and crank case vent hose. The oversized cone shaped air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This air intake is relatively easy to install usually in 90 minutes or less using existing factory mounting points. The tools needed are a screwdriver, pliers and several wrenches. Some K&N 77 series air intakes are not legal for sale or use in California and other states adopting California emission standards while others are CARB exempt and 50 state legal. Check the K&N catalog or website for vehicle applications and specific CARB status for each vehicle and air intake.

[More Information on K&N 77 Series Air Intake Systems]

Product Specifications

Estimated Horsepower Gain11.91 HP @ 5536 RPM
Air Filter ColorRed
Air Filter Height6 in (152 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
CARB EO NumberD-269-48
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included5
Couplers Included2
Intake Pipe Color / FinishSilver
Intake Pipe MaterialAluminum
Product Box Height12.5 in (318 mm)
Product Box Length22.25 in (565 mm)
Product Box Width14.25 in (362 mm)
Product Style77 Series Kits
Replacement FilterRC-5173
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight11 lb (5 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.

K&N 77-2585KS Air Intake Product Reviews

Tuesday, October 11, 2016 - Part 77-2585KS
Was skeptical it would improve performance, but reviews listed it as the number one performance enhancement for the 3.7L F150. Installation instructions are very good and took about 90 minutes to remove, clean and install. Improved acceleration and towing performance were noted immediately. Has boosted gas mileage by 10, easily, and the highway cruising has improved with less downshifting on inclines while in cruise control. Very happy with the unit.

Joel Bequeath
Manchester, New Hampshire
Thursday, September 22, 2016 - Part 77-2585KS
Great fit and finish. Highway mileage improved by 2 on 3.7 liter WT Ford engine. Love it!

Willaim Housley
Simpsonville, South Carolina
Wednesday, August 10, 2016 - Part 77-2585KS
I own a 2013 Ford F150 Supercab 4X4 3.7L, when I purchased this truck Ford advertised as 13L/100km, with the factory 17 tires I was only able to attain 15L/100km. This is city driving (@ 300m above sea level, 87 octane gas)) regularly ascending and descending from +630m. I up graded the truck tires to (Brand Name) TA mud and snow Tire. This tire upgrade was great, in snow mud etc, except fuel economy took a beating. My Fuel consumption jumped to 17L/100km. I was not sure of K&N and the claim of savings, I was sceptical of having noticeable savings per tank of fuel, a friend of mine had a setup similar to this on his Jeep it sounded great and he claimed fuel savings. So I took the risk, hey whats the worst that could happen? Have raspy sounding truck and maybe the same fuel consumption? Well I have some initial results, when I first installed it I enjoyed the remainder of the tank of gas, and lead footed it, enjoying the sound and noticeable pickup in response as well as having torque response change in the positive. After I settled down with a full tank, I was pleasantly surprised that I was seeing 15L/100km and occasionally and only momentarily going up to 16L/100km when I lead foot it. I will be going on a long highway trip soon and hope to be able to report back with my findings. I would also like to note that purhaps Ford's claim of 13L/100km is possible with factory tires, yet they really limit you to city driving.

David Koivukangas
Kelowna, Canada
Wednesday, March 4, 2015 - Part 77-2585KS
Seems to be what I wanted

Darrin Duckworth
Conover North Carolina
Tuesday, December 23, 2014 - Part 77-2585KS
I recently added a K&N Cold Air Intake and a Magnaflow Cat-Back exhaust to my 2013 Ford F-150 with the 3.7 engine. I'm very happy with the quality of the intake, and the resulting performance increase. The truck was missing some low end performance and had a little hesitation during acceleration. Both those issues have improved substantially.

Jim Kirwan
Miami, Florida
Thursday, January 16, 2014 - Part 77-2585KS
Had a mechanic friend put this in for me on my 2013 F-150. It took him just over an hour. Instantly saw better gas mileage. Went from averaging 15mpg to 18mpg which is the main reason I got it! Sounds good when you rev it too. Hard to gauge the horsepower increase but I'm sure it's there.

Friday, November 1, 2013 - Part 77-2585KS
Love this product.
Except for a shipping problem,left out attaching parts,I would recommend this product to anyone looking for better engine performance.
I picked up 2 MPG right off the bat.
Love the more muscular sound of the engine.

Lindo Rossi