K&N High Flow Air Filter for Kawasaki Ninja 400/ 500/ ZX 4R - KA-4018
K&N High Flow Air Filter for Kawasaki Ninja 400/ 500/ ZX 4R - KA-4018
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K&N High-Flow Air Filter | Kawasaki Ninja 400 / 500 / ZX-4R (KA-4018)
Maximize the performance of your Kawasaki sportbike with the K&N KA-4018. This high-flow air filter is the gold standard for the modern Kawasaki sub-500cc platform. Whether you're commuting on the new Ninja 500, track-day racing the ZX-4R, or carving canyons on the Ninja 400, this filter ensures your engine receives the clean, high-velocity air it needs to perform.
Key Features
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Universal Platform Performance: Specifically designed to fit the 399cc (Ninja 400), the new 451cc (Ninja 500), and the high-revving 399cc inline-four (ZX-4R/RR) engines.
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Designed to Increase Horsepower: Engineered to provide up to 50% more airflow than restrictive paper filters, boosting throttle response and top-end pull.
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Superior Engine Protection: Multiple layers of oiled cotton gauze media provide up to 99% filtration efficiency, shielding your engine from road grit and track debris.
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Washable & Reusable: This "Lifetime" filter is pre-oiled and ready to install. It is designed to be cleaned and re-oiled for the life of the motorcycle.
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Precision Fit: Custom-engineered with an application-specific sealing bead to ensure an airtight, perfect fit within the factory airbox.
Technical Specifications
| Feature | Specification |
| Model Code | KA-4018 |
| Brand | K&N |
| Filter Material | High-Flow Oiled Cotton Media |
| Compatibility | Ninja 400 (2018–2024), Ninja 500 (2024–2026), ZX-4R/RR (2023–2026), Z400/Z500, Eliminator 450/500 |
| Air Filter Shape | Trapezoidal |
| Warranty | 10-Year / Million Mile Limited Warranty |
Why Choose K&N for your Kawasaki?
The Ninja 400 and ZX-4R are beloved for their high-revving nature. Stock paper filters can struggle to keep up with the airflow demands at the redline. The KA-4018 addresses this by using high-flow cotton media, which maintains its efficiency even as it gets dirty. This is a "drop-in" performance part, meaning no fuel-mapping or ECU tuning is required to feel the difference in engine smoothness and response.
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