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The K&N 57S-4000 Performance Air Intake System replaces the restrictive factory air filter and air box lid on select Ford C-Max, Focus II, Volvo C30/S40/V40/V50/V70, and Mazda 3/5 models. It reduces air flow restriction while smoothing and straightening airflow to deliver more air to the engine for increased power and acceleration across the RPM range. This system includes an oversized conical high-flow air filter and injection molded air box lid built to last the life of the vehicle.
Key Features
- Long Service Life: High-flow air filter lasts up to 100000 miles before cleaning depending on driving conditions.
- Power Gains: Allows engine to inhale larger volume of air than stock setup for noticeable torque and horsepower increases throughout RPM range.
- Washable Reusable Filter: Lifetime conical filter cleans easily and provides consistent performance without replacement.
- Direct fit using factory mounting points no cutting or drilling needed.
- Filter requires cleaning based on driving conditions not fixed interval.
- Proven designs increase airflow and engine performance since 1969.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2013-2017 | Ford | C-Max | Energi SE, Energi SEL, Energi Titanium, Hybrid SE, Hybrid SEL, Hybrid Titanium |
| 2013-2018 | Ford | Focus | RS, S, ST, Titanium |
| 2014-2016 | Ford | Transit Connect | Titanium, XL, XLT |
Specifications
| Brand | K&N Engineering |
|---|---|
| Manufacturer Part Number | 57S-4000 |
| Product Type | Cold Air Intakes |
| Fitment Type | Vehicle Specific |
| Condition | New |
What's Included
One new K&N cold air intakes identified by manufacturer part number 57S-4000. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.
About K&N Engineering
K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.
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Frequently Asked Questions
How do I confirm K&N 57S-4000 fits my vehicle?
Match the year, make, and model in the fitment table, then confirm the engine, factory housing, sensor layout, emissions notes, and any application restrictions stated for this exact part.
Does K&N 57S-4000 require tuning or emissions verification?
Requirements vary by vehicle and intake configuration. Check the current K&N application and emissions notes, and complete any required calibration before full-load operation.
What should be checked after installing K&N 57S-4000?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.
Installation Instructions
- Typically completes in 90 minutes or less with basic hand tools
- Direct fit using factory mounting points no cutting or drilling needed
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