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Ships within 48 hours · Estimated delivery Sep 17 - Sep 22
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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.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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- If time is of the essence, please consider selecting expedited delivery for faster service.
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]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
run small.
Size: 7.5 Little Kid, Color: Peri
I was a fool and didn't size up, our daughter was only able to sue them for a minute. Should have sized up 2 sizes, I know better. A bit chunky too which I forgot about with these shoes, but fun color and easy to put on.
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Reviewed in the United States on October 4, 2025
★★★★★ 5
Stylish and comfortable
Great for my toddler, very easy for him to walk in. They’re sturdy but lightweight and have good traction so he doesn’t slip. He does have really fat feet so the Velcro is a little tight if you’re between sizes with a fat foot toddler size up
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Reviewed in the United States on August 28, 2025
★★★★★ 5
Great toddler sneakers
Size: 9.5 Toddler, Color: Navy/Silver/Pink
Love these sneakers. They’re our 2nd pair — my daughter loved her 1st pair (grey) so when she outgrew those, we bought the navy. They’re easy for her to put on at age 3/4, and they’re comfortable for her wide feet.
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Reviewed in the United States on December 18, 2025
★★★★★ 5
This is our go-to shoes for our kids
Size: 12 Little Kid, Color: Grey/Silver/Pink
I have been buying these shoes for my two toddler girls for a few years now. They are not cheap but they use good quality material. The only downside is the velcro closure is not that great compared to the rest of the shoe. The velcro becomes weak or not as sticky well before the shoe has run its course. They come in a variety of colors which is fun for the kids. One of my daughters has sensitive fee or just fine shoes generally uncomfortable and she never has a problem with these. I also love that they're available in half sizes. And I find them to be true to size
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Reviewed in the United States on January 8, 2026
★★★★★ 4
Easy on and off
I’m a big fan of Sauconys so I wanted to introduce my daughter to my love of sneakers. These are good shoes and they’ve held up well. They show a lot of dirt but they’re worn by a toddler so I guess that’s expected. They’re lightweight so my daughter can easily walk in them. My only complaint is the length of the Velcro fastener. We use thin socks and the fastener barely goes halfway across the shoe. It just looks odd to me. Otherwise, it’s a great shoe. I’ll definitely buy more.
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Reviewed in the United States on August 20, 2023
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