SKU: KA-4018 | UPC: 024844368539
K&N KA-4018 Replacement Air Filter for 2018-2021 Kawasaki Ninja 400 Z400
Replace your stock air filter with the K&N KA-4018 high-flow unit designed for 2018-2021 Kawasaki Ninja 400 (EX400) and Z400 (ER400) models including ABS and KRT editions. This direct-fit filter delivers low restriction for better airflow increased horsepower and torque while maintaining strong engine protection. Pre-oiled and ready to install it offers washable reusable performance built to last.
Key Features
- Custom Fit Design: Application-specific base seal and sealing bead ensure precise installation on Kawasaki Ninja 400 and Z400 engines
- Performance Gains: Increases horsepower and torque through high-flow cotton gauze media that allows more air into the engine
- Filtration Excellence: Multiple layers of woven cotton gauze provide superior dirt and particle capture without sacrificing airflow
- Durability: Pleated media creates large surface area for extended service life between cleanings
- Washable Reusable: Clean with K&N service kit oil and reinstall no replacement needed
Product Notes
- Pre-oiled and ready to drop into your airbox no additional preparation required
- Service every 50000 miles under normal riding conditions for peak performance
- Ships in protective cardboard box measuring 8 x 8 x 2 inches
Installation Notes
- Professional installation recommended.
- Direct replacement removes stock filter installs in minutes with basic tools
- Compatible with factory airbox no modifications or additional hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2021 | Kawasaki | Ninja 400 | Base |
| 2018-2021 | Kawasaki | Ninja 400 | ABS |
| 2020 | Kawasaki | Ninja 400 | ABS KRT Edition |
| 2020 | Kawasaki | Ninja 400 | KRT Edition |
| 2018-2021 | Kawasaki | Z400 | Base |
| 2018-2021 | Kawasaki | Z400 | ABS |
| 2019-2021 | Kawasaki | Z400 | ABS Base |
Why Choose K&N?
- Made in the USA with over 40 years of air filter manufacturing experience
- Lifetime Limited Warranty covers defects in materials and workmanship
- Engineered for exact vehicle fit and real-world performance gains
Frequently Asked Questions
- Q: Will KA-4018 fit my 2018 Kawasaki Ninja 400 ABS?
A: Yes direct fit for all 2018-2021 Ninja 400 including Base ABS KRT Edition and Z400 models replaces OEM filter exactly - Q: What filter media does it use?
A: Four layers of oiled woven cotton gauze for high airflow and fine particle filtration - Q: How do I maintain the warranty?
A: No-Hassle Lifetime Limited Warranty requires cleaning with K&N kit every 30000-50000 miles depending on conditions
Shipping &. Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Protective box 8 x 8 x 2 inches
- Weight: 0.65 lbs
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