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High-Flow Reusable Air Filter for the Smart Fortwo 1.0L Engine
The K&N Performance Air Filter KNN33-2417 is a direct drop-in replacement air filter for the Smart Fortwo and Fortwo Cabrio equipped with the 1.0L three-cylinder engine, providing improved airflow over the factory paper filter with K&N's signature oiled cotton gauze media for enhanced filtration efficiency across an extended service interval. The KNN33-2417 is engineered to match the exact dimensions of the factory Smart Fortwo air filter for a tool-free filter swap with no modifications required, and is rated by K&N for up to 75,000 miles between cleaning intervals for reduced maintenance cost over the life of the vehicle.
Key Features
- KNN33-2417 high-flow replacement air filter for Smart Fortwo 1.0L, direct drop-in fitment
- K&N oiled cotton gauze filtration media for improved airflow over factory paper filter
- 75,000-mile cleaning interval for reduced maintenance compared to disposable paper filters
- Washable and reusable design for long-term cost savings over repeated paper filter replacements
- Million-mile limited warranty from K&N Engineering
- OE drop-in shape and size for tool-free filter installation in the factory airbox
Fitment
| Year Range | Make | Model |
|---|---|---|
| 2007-2015 | Smart | Fortwo |
Specifications
| Detail | Value |
|---|---|
| Part Number | KNN33-2417 / 33-2417 |
| Brand | K&N Engineering |
| Filter Type | Drop-in replacement, oiled cotton gauze |
| Application | 2007-2015 Smart Fortwo 1.0L |
| Service Interval | Up to 75,000 miles between cleanings |
| Warranty | Million Mile Limited Warranty |
| UPC | Verify with K&N Engineering |
What's Included
- 1 x KNN33-2417 K&N replacement air filter
- K&N product documentation
About K&N Engineering
K&N Engineering has been manufacturing high-flow air filters and intake systems since 1969, with their oiled cotton gauze filtration technology used in millions of street vehicles and hundreds of motorsport championships worldwide. Every K&N filter carries a Million Mile Limited Warranty.
FAQ
What is the KNN33-2417?The KNN33-2417 is a K&N Engineering oiled cotton gauze drop-in replacement air filter for the 2007 through 2015 Smart Fortwo (and Fortwo Cabrio) with the 1.0L engine. It installs directly in the factory airbox with no modifications and is designed for a 75,000-mile service interval before its first cleaning.
Is KNN33-2417 compatible with the Smart Fortwo Cabrio?Yes. KNN33-2417 is compatible with both the Smart Fortwo coupe and Fortwo Cabrio versions equipped with the 1.0L three-cylinder engine across the 2007 to 2015 model years.
How does KNN33-2417 compare to the factory paper filter?The factory paper filter is a single-use disposable element typically replaced every 15,000 to 30,000 miles. KNN33-2417 uses K&N oiled cotton gauze construction that flows more air at equivalent filtration efficiency, with a service interval up to 75,000 miles and full reusability after cleaning.
Does KNN33-2417 require any modification to the factory airbox?No. KNN33-2417 is dimensioned to match the factory Smart Fortwo air filter exactly, dropping into the factory airbox without cutting, drilling, or hardware changes.
How do I clean KNN33-2417?K&N recommends cleaning with K&N Power Kleen filter cleaner, rinsing, allowing the filter to dry completely, and re-oiling with K&N filter oil before reinstallation. Do not use compressed air to dry the filter and do not reinstall while wet.
Does KNN33-2417 improve horsepower on the Smart Fortwo?KNN33-2417 improves airflow through the factory airbox compared to a paper filter. Power gains from a drop-in filter alone are typically minimal on a stock airbox but contribute to the overall air delivery efficiency of the induction system.
Is KNN33-2417 street legal?Yes. KNN33-2417 is a drop-in replacement that operates within the factory airbox and is CARB-exempt in California for most model year applications. Check K&N's CARB EO status if required for your state.
When should KNN33-2417 be serviced?K&N recommends inspecting the filter every 50,000 miles and cleaning it when visually dirty or at the 75,000-mile service interval, whichever comes first under normal driving conditions. More frequent service intervals may be needed in dusty environments.
Installation Overview
- Allow the engine to cool before opening the airbox
- Open the factory airbox housing by releasing the clips or removing the retaining screws
- Remove and discard or retain the factory paper filter
- Drop in the KNN33-2417 K&N filter, ensuring it seats fully in the airbox housing
- Close and re-secure the airbox housing
- Reinstall any vacuum or breather lines disturbed during access
- Start the engine and verify correct idle before returning to normal driving
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