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K&N Performance Cold Air Intake Kit 57-2556 with Lifetime Filter for ford Expedition/F150, Lincoln Mark LT 5.4L V8

4.4 out of 5 stars 128 customer reviews
| 29 answered questions

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Air Intake System
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  • Estimated horsepower gain of 15.46 HP at 3829 RPM
  • Designed to improve throttle response and engine sound
  • Lasts up to 100,000 miles before service is required (depending on driving conditions)
  • Replaces entire factory air intake system
  • Easy to install, usually in 90 minutes or less
84 new from $281.98 3 used from $243.09
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Frequently Bought Together

  • K&N Performance Cold Air Intake Kit 57-2556 with Lifetime Filter for ford Expedition/F150, Lincoln Mark LT 5.4L V8
  • +
  • Airaid 400-531 PowerAid Throttle Body Spacer
Total price: $418.49
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Product Information

Style:Air Intake System

Technical Details

Brand K&N
Item Weight 14 pounds
Product Dimensions 18 x 18 x 12 inches
Item model number 57-2556
Manufacturer Part Number 57-2556
OEM Part Number 57-2556
Folding No

Technical Specification

Additional Information

ASIN B000CO9U32
Customer Reviews
4.4 out of 5 stars 128 customer reviews

4.4 out of 5 stars
Best Sellers Rank #27,873 in Automotive (See top 100)
#21 in Automotive > Performance Parts & Accessories > Filters > Air Intake
#25 in Automotive > Performance Parts & Accessories > Emission System
#39 in Automotive > Replacement Parts > Filters > Air Intake
Shipping Weight 14 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Shipping Advisory This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
Date First Available February 13, 2005

Warranty & Support

Warranty, Parts:Parts
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Product Description

Style: Air Intake System

Product Description

The 57 Series Generation II air intake, also referred to as an FIPK, is K&N's ultimate performance product. These performance intakes are designed to increase power by as much as 10%. 57 Series FIPK's are CARB exempt, street legal in all 50 US states, come with K&N's Million Mile Limited Warranty and are guaranteed to increase power. K&N air intake systems replace your vehicle's restrictive factory air filter and air intake housing. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This translates into more power and torque for your vehicle. The air filters on these kits are washable and reusable. Most of our air intake systems are easy to install using tools commonly available (see installation instructions).

Amazon.com

Designed to provide increased horsepower, the K&N 57-2556 Second Generation Fuel Injection Performance Kit is a quick solution for vehicle owners who are looking for an increase in reliable power. Street legal, installable in 90 minutes or less and built around K&N's High-Flow technology, which utilizes a special oversized and washable cotton gauze air filter and special cold air intake, nonmetallic tubes, the 57-2556 drives a massive amount of air into an engine, which translates into power affordable on virtually any budget.

K&N Engineering logo
K&N 57-2556 Fuel Injection Air Intake Performance Kit
Affordable, street legal horsepower upgrade.
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Horsepower increase based on installation of a K&N 57-2556 Fuel Injection Air Intake Performance Kit
Measurable improved performance.
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Detailed installation instructions and parts list for the K&N 57-2556 Fuel Injection Air Intake Performance Kit
Quick and easy installation.
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How High-Flow Technology Works
How does the K&N 57-2556 increase horsepower? By eliminating airflow obstruction in your engine. Restriction of air flow between an air filter and an engine robs even the most powerful engine of horsepower. K&N air intake kits virtually eliminate air path restriction by replacing the standard air filter and the entire air path to the engine. The aerodynamically engineered conduit that makes up the 57-2556 drives a massive amount of air into an engine, which translates into power. This conduit begins with an oversized conical high-flow air filter. This larger filter can fit into the engine compartment using factory holes and mounting points because the K&N 57-2556 replaces your stock intake tube, and air box. This provides more airflow at lower restriction than a standard filter, limited by the size of the factory air box. The oversize air filter also captures and holds more dirt, increasing the service life before a cleaning is required (up to 100,000 miles). The filter is also isolated from high engine temperature by a heat shield designed to lower the temperature of the air entering the engine, which increases horsepower.

The filter attaches to a rotationally molded tube made from nonmetallic interlaced high density polyethylene (HDPE). This allows for precision shaping of the tube to reduce turbulence and accelerate airflow into the engine. This is why some K&N tubes have unique shapes or indentations that are specifically engineered for each engine configuration. Finally, the tube is connected to the engine with adapters made from high strength materials such as silicon and reinforced nylon and ensures long life. Put all this together and you have the best high-flow intake system available today.

Street Legal
Many K&N intake systems are street legal in all 50 states and include a California Air Resource Board (CARB) Executive Order (EO) number that ensures the kit has been tested to comply with emissions standards. EO numbers apply to the kit as well as the year, make and model it is being installed on. Systems with no EO number are street legal in most states but may not be used on emissions controlled vehicles in the state of California or other states adopting California emission standards. Consult K&N's website to search by part to see which cold air intakes are CARB exempt for which vehicles.

Key Features:

  • Guaranteed to provide increased horsepower and acceleration (15.47 hp @ 3,829 rpm measured by manufacturer).
  • Engineered to specific vehicle design. See vehicle search above for compatibility.
  • Easy to install, usually in 90 minutes or less and lasts up to 100,000 miles before service is required, depending on driving conditions.
  • CARB exempt and street legal in all 50 US States.
  • Air filter is washable and reusable for extreme durability, but can also be easily replaced if necessary.
  • Works with original manufacturer computer systems.
  • Replaces OEM filter and air box, and is designed to use factory holes and mounting points whenever possible.
  • Million mile limited warranty.
What's in the Box
1-K&N 57-2556 Second Generation Fuel Injection Performance Kit (includes air intake tube, washable air filter, heat shields, hoses, hose clamps, hardware and detailed instructions necessary for installation).

Limited Warranty
K&N O/E replacement air filters and air intake systems purchased from authorized dealers are backed by a million mile limited warranty from the manufacturer when used primarily on paved roads and on vehicles for which they were designed. If one of these products ever fails to provide complete satisfaction, K&N will replace it at their discretion.

About K&N Engineering
K&N Engineering, of Riverside, California, is the inventor and leading innovator of reusable cotton gauze filter technology for automotive applications. From humble beginnings as a family run business over 35 years ago, K&N Engineering, now a truly global company with offices in the UK and the Netherlands, continues to exist as a family owned business with an enthusiast mindset and a direct connection with motor sports that carries over throughout all levels of management and manufacturing.

* Note: Some FIPK's will not fit on vehicles with lift kits. Diesel pickup truck performance intakes for Power Stroke, Duramax and Cummins Engines are also available.


From the Manufacturer

Also available: K&N Cabin Air Filters

The K&N Washable Cabin Air Filter is the first of its kind designed to replace your vehicle's stock cabin air filter with a washable and reusable version that cleans and freshens incoming air. K&N Cabin Air Filters are designed to be cleaned and reused over and over again. Using a combination of an advanced synthetic filter media and K&N Refresher spray, the K&N Washable Cabin Air Filter grabs and holds dust particles.

Cabin Air Filters

Oil Filters

Replacement Air Filters

Recharger Kits


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: Air Intake System Verified Purchase
Actually just installed this product yesterday on my 2004.5 F150 Lariat with 5.4 Triton. Whole process took about 1.5 hrs. or so. Instructions were pretty decent with two exceptions:

1) Was instructed to remove the overflow hose from radiator to overflow tank. Presumably because it would be too short or otherwise in the way. This required getting a bucket to catch liquid from top of radiator & about 7-8 min. to swap out. It turned out to be totally unneeded. The existing hose could have stayed exactly the way it was. In fact, the replacement hose is more in the way as it is not contoured to go around the filter/heat shield box as well as the existing one was.
2) After mounting the air tube/filter through the heat shield near the end of install, noticed that there was a large open gap around that tube. Didn't make sense as heat/dirt could easily get through & it seemed incomplete. So, I took the remaining piece of excess rubber "edge trim" (that goes on top/side of heat shield) & installed it around the inside edge of the round opening for the tube in the heat shield. Worked like a charm to seal that gap. Although, they don't tell you to do it, it totally makes sense.

After install, took a long ride to check it out. There was a definite change with the throaty sound when accelerating & a slight kick in the responsiveness. After a second longer drive a bit later, the sound & acceleration improved a bit more. Perhaps the engine computer/mass air sensor had to adjust to the change - it seemed to run even better after the second drive. Hasn't been long enough to check on the mpg as yet. But, when I did the same installation on another car of mine, it did make roughly a 1.5 mpg increase.

I'll say that it sure makes more room under the hood.
Read more ›
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By MWare on September 4, 2014
Style Name: Air Intake System
Great addition if you're looking to perk up an older engine or to give your new engine extra ponies.

Pros: Very easy to install, you can truly feel a horsepower improvement, helps to improve throttle response, great written instructions with step by step photos, fantastic step by step video instructions on K&N's website, only 90 min install, top notch customer service, you get to remove 15lbs of complicated plastic and replaced it with 3lbs of simple straight pipe tubing and a ginormous filter, vortex sound when you accelerate hard (personal preference), military discount if ordered direct from K&N

Cons: Pricey for some plastic tubing and a big air filter... but still worth it, pay close attention to the bolt diagram, it can be easy to mix up which bolts go where and it doesn't help that they give you extra hardware (the extra hardware is needed for some of the ½ year models)

Notes:
K&N Does NOT make ANY claims to improved gas mileage.
While you have the throttle body off it's a good idea to clean it (if needed) with some carb cleaner. Carbon tends to build up around the edge of the butterfly valve and can degrade throttle response and cause the computer to make your truck run rich at idle. It only takes two minutes and you've already done the hard work by removing the throttle body... just a thought.
Gumout 800002231 Carb and Choke Cleaner Jet Spray - 14 oz.
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Style Name: Air Intake System Verified Purchase
I had to return this item. I have installed several FIPK on different vehicles over the years. I expect to hear a louder intake noise from the motor, but the noise this unit makes is unbearable. It's not bad during normal driving, but the second you give it a little more gas than normal, the noise from the motor is loud and obnoxious. If it made the truck sound "better" I could have left it, but the sound is higher pitched and just doesn't fit with the truck. I have the 2004 5.4L motor - not sure if this effects others with the 4.8L motors or other years of this truck.
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By TruGospel on January 31, 2013
Style Name: Air Intake System Verified Purchase
I installed this cold air intake on my 2008 Ford FX4 and, I'm tellin' ya, this thing is AWESOME!! I love it!! I think it took me a little over an hour to install (maybe between 1 1/2 to 2) but K&N's supplied instructions were good with some good photos to go along with them for each step. There were a couple of steps that didn't quite make sense to me at first but I eventually figured them out and the install itself was pretty straightforward and fairly easy - provided you take your time and don't rush it. The quality of this kit is great and I couldn't have asked for a better fit under the hood. But, the best part is that, my truck sounds AWESOME now!! :-) The engine sound is much louder - which my wife still can't get used to ... but, it's not her truck, right? ;-D I know I'm getting more horsepower and I think I'm even getting better gas mileage (provided I can stay "out of it" ;-D). I am VERY pleased with this kit and I highly recommend it. :-)
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Style Name: Air Intake System Verified Purchase
Lets see
Install easy,dont remove the radiator overflow hose. Also, put the extra cutoff trim around the guard hole.

Fuel mlg before around town before install 11.6 after install 11.6
towing 8 after install 8
Growl intake sound <1/2 throttle not noticeable
Loud v8 intake growl making it feel like you have 500 extra HP. (in reality i cant tell a difference)
Pushing the truck up a hill under WOT towing, 8000 lbs 20 miles up I-8 from sea level to 5500ft - priceless..

The sound makes the 2005 f150 feel faster and more powerful. I dont know if it is.
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