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Intake Kits > Performance Intake Kit

List Price: $551.11
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77-2578KS
 
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The K&N 77-2578KS high-flow performance air intake system is a free-flowing, mandrel-bent aluminum tube air induction system designed to fit some Ford Flex 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 77-2578KS air intake comes with a chrome topped K&N high-flow air filter and a heat shield that installs into the previous air box space. 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, crank case vent hose and a replacement silicone EVAP 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, ratchet set and some 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]
  • 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
Video Installation Video

Product Specifications

Estimated Horsepower Gain9.19 HP @ 4914 RPM
Air Filter ColorRed
Air Filter Height6 in (152 mm)
Air Filter Large End Diameter7.5 in (191 mm)
Air Filter MaterialCotton Gauze
Air Filter Outlet ShapeRound
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 FilterRF-1048
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight10.5 lb (4.8 kg)
Horsepower gains based on similar vehicle dynamometer test. Results will vary.


Customer Feedback


Outstanding products. Purchase two K&N filters, one for my 2008 Gmc Sierra and one for a 2008 Ford Mustang GT. Noticed an immediate increase in horsepower. Thank you.
Joseph Wilson, United States
Have had increased performance and very satisfied since installing the KN Air Filter. We have a 2012 Ford Fiesta 4 Cyl. that no longer has a hard time taking the steep hills in our terrain Vehicle has more HP in freeway driving when needed
Dan, Pittsburgh, Pennsylvania
I'm very pleased with this product. The moment I installed this intake on my 2012 Ford F-150, I could feel and defiantly hear the difference. My truck sounds like a beast and the gas mileage is significantly better. I'm glad I bought it.
Randy Acosta , Katy, Texas