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SKU: 57-2556 | UPC: 024844109507
K&N 57-2556 Performance Air Intake System: 2004-2008 Ford F-150 5.4L V8, 2005 Ford Expedition 5.4L, 2006-2008 Lincoln Mark LT 5.4L
The K&N 57-2556 delivers more airflow to your 2004-2008 Ford F-150 5.4L V8, 2005 Ford Expedition 5.4L V8 or 2006-2008 Lincoln Mark LT 5.4L V8 engine for dyno-proven gains of 12.3 horsepower at 6074 RPM and added torque. This complete system replaces the factory air filter and intake tube with a roto-molded HDPE tube and oversized high-flow oiled cotton filter protected by a custom heat shield. Installation takes less than 60 minutes using basic hand tools and improves throttle response across the powerband.
Key Features
- High-Flow Air Filter: Washable reusable oiled cotton media lasts up to 100000 miles between cleanings under normal highway conditions for long-term performance and protection
- Roto-Molded HDPE Intake Tube: Increases intake volume and smooths airflow to the engine for measurable horsepower and torque gains
- Custom Heat Shield: Blocks hot engine bay air to deliver cooler denser intake charge for better combustion efficiency
- Easy Bolt-On Design: Direct replacement for stock components with no cutting or permanent modifications required
- Proven Power Gains: Dyno-tested 12.3 HP increase at 6074 RPM specifically for 5.4L V8 applications
Product Notes
- Replaces factory air filter and intake tube completely
- Clean filter every 100000 miles or as needed with K&N cleaning kit
- Ships in protective box: 22 x 14.5 x 9.2 inches, product weight 8.75 lbs
Installation Notes
- Professional installation recommended.
- Completes in 60 minutes or less using basic hand tools like screwdriver and pliers
- Uses existing factory mounting points and hardware for precise OEM-style fit
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2008 | Ford | F-150 | XL |
| 2004-2008 | Ford | F-150 | XLT |
| 2004-2008 | Ford | F-150 | FX4 |
| 2005-2008 | Ford | F-150 | King Ranch |
| 2007-2008 | Ford | F-150 | FX2 |
| 2006-2008 | Ford | F-150 | Harley-Davidson Edition |
| 2008 | Ford | F-150 | Limited |
| 2008 | Ford | F-150 | 60th Anniversary Edition |
| 2005 | Ford | Expedition | Eddie Bauer |
| 2005 | Ford | Expedition | Limited |
| 2005 | Ford | Expedition | XLS |
| 2005 | Ford | Expedition | XLT |
| 2006-2008 | Lincoln | Mark LT | Base |
Why Choose K&N?
- Decades of air intake engineering for Ford trucks with millions of systems on the road
- Dyno-tested results and No-Hassle Lifetime Limited Warranty on every kit
- High airflow design paired with premium filtration for power without sacrificing engine protection
Frequently Asked Questions
-
Q: Will this fit my 2006 Ford F-150 5.4L XLT?
A: Yes, the 57-2556 fits all 2004-2008 F-150 5.4L V8 models including XL, XLT, FX4, King Ranch, FX2, Harley-Davidson, Limited and 60th Anniversary editions -
Q: What materials are used in construction?
A: Roto-molded high-density polyethylene HDPE tube with oversized conical oiled cotton gauze filter media and powder-coated steel heat shield -
Q: What is the warranty and maintenance?
A: Backed by K&N No-Hassle Lifetime Limited Warranty. Filter cleans every 100000 miles under highway use with K&N oil and cleaner kit. Will not void vehicle warranty
Shipping & Handling
- Method: Ground shipping via UPS or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure box 22 x 14.5 x 9.2 inches
- Weight: 8.75 lbs
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