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Description
K&N Performance Intake Kit for Ford C-Max/Focus II / Volvo C30/S40/V40/V50/V70 / Mazda 3/5The K&N 57S 4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57S 4000 Performance Airbox comes with an
The K&N 57S-4000 Performance Airbox replaces the restrictive factory air filter and air box lid. K&N performance air boxes are designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57S-4000 Performance Airbox comes with an oversized conical K&N high-flow air filter and an injection molded air box lid with the K&N logo embossed on top. The air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This performance air box is relatively easy to install into the air box base with commonly available tools. K&N builds these air box systems to last for the life of your vehicle and they are backed by K&N's Million Mile Limited Warranty. Some K&N 57S Series Performance Airboxes are compliant with the latest TUV emissions and sound regulations. Check the K&N catalog or website for vehicle applications and specific TUV status for each vehicle and air intake.Installation Instructions
Installation Instructions
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2017 | Ford | C-Max | Energi SE |
| 2013-2016 | Ford | C-Max | Energi SEL |
| 2017 | Ford | C-Max | Energi Titanium |
| 2013-2017 | Ford | C-Max | Hybrid SE |
| 2013-2016 | Ford | C-Max | Hybrid SEL |
| 2017 | Ford | C-Max | Hybrid Titanium |
| 2016-2018 | Ford | Focus | RS |
| 2013-2015 | Ford | Focus | S |
| 2013-2015 | Ford | Focus | SE |
| 2013-2018 | Ford | Focus | ST |
| 2013-2015 | Ford | Focus | Titanium |
| 2014-2016 | Ford | Transit Connect | Titanium |
| 2014-2016 | Ford | Transit Connect | XL |
| 2014-2016 | Ford | Transit Connect | XLT |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 587 reviews
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Product Reviews
★★★★★ 1
Made in China? Really famous German brand Bosch?
Made in China? Really famous German brand Bosch? I would not have bought this filter for my Porsche Macan if I'd known it was made in China and would have bought a German-made Mann or Mahle filter like I have in the past.
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Reviewed in the United States on April 13, 2026
★★★★★ 5
Worked well.
Worked well.
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Reviewed in the United States on October 24, 2024
★★★★★ 5
Perfect fit
Good quality for Porsche. Easy to install.
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Reviewed in the United States on March 10, 2024
★★★★★ 5
Factory Brand Great filter kits
I just wanted to write a current review of a product I have used for about ten years now. Our Family is a BMW fan. We call them the German Honda's. Our experience with seven vehicles over the years and to this day have proven how reliable these cars are. Anyways back to these filters, the Mann filter is the factory filter just boxed up in a BMW box. this kit comes with all the o-rings and a new drain plug. while you don't have to have a new drain plug it is nice to have as they torque down and the threads are plastic. I have ALWAYS changed oil at 10K not the 15K interval. I also only use the mobil1 syn Thats a different review but suffice to say if you see your oil at 10K vs 15K you would change your oil at 10 as well. these filters are again a perfect fit the kit comes with all needed o rings and at this price I usually order 4-6 at a time. We have four cars at the moment this is the first time I have ordered from amazon ( I resisted until now) feeling dumb to be so late to the amazon game. I usually try to support (The local auto parts) but during the covid lock down I used amazon. I saved about $3.25 per filter. which is not a small amount when we go through 8 filters a year but also even mathed out over the last ten years is only $300 to support the local shop that I do buy other parts at as well.
Long review to say these are great filters and again get the kit use the new plug and happy driving for years
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Reviewed in the United States on April 29, 2020
★★★★★ 5
328i with the plastic plug
Perfect kit for 2013 BMW 328i non xDrive. Great Price
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Reviewed in the United States on March 12, 2026