SKU: HA-4099 | UPC: 024844040794
K&N HA-4099 Replacement Air Filter for 1999-2009 Honda TRX400EX / 2009-2014 TRX400X
The K&N HA-4099 is a direct drop-in replacement air filter designed for Honda TRX400EX (1999-2009) and TRX400X (2009-2014) ATVs. This washable high-flow filter delivers clean air for better carburetion at any altitude while increasing horsepower and acceleration without jet changes. Engineered with pleated cotton gauze for superior filtration and airflow in dusty off-road conditions.
Key Features
- Washable &. Reusable: Pre-oiled and ready to install cleans easily with K&N cleaning kit for long service life and low maintenance costs
- High Airflow Design: Pleated cotton media provides large filtration area with low restriction for high-capacity performance and extended intervals between cleanings
- Direct OEM Fit: Seals precisely into factory airbox with application-specific bead ensuring no air leaks and easy installation
- Multi-Layer Filtration: Woven cotton gauze captures dirt and dust while allowing maximum airflow for consistent power gains
- No Modifications Needed: Installs without fuel system changes or jetting adjustments to deliver immediate performance improvements
Product Notes
- Pre-oiled for immediate use in off-road motocross ATVs UTVs and side-by-sides
- Service every 50 hours of riding or when dirty clean with K&N oil for peak performance
- Lightweight design ships compactly with 0.6 lb product weight
Installation Notes
- Professional installation recommended.
- Remove stock filter from OEM airbox and drop in HA-4099 no cutting or drilling required
- Compatible with all factory hardware and mounting points
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1999-2008 | Honda | TRX400EX Sportrax | Base |
| 2009 | Honda | TRX400X | Base |
| 2012-2014 | Honda | TRX400X | Base |
Why Choose K&N?
- Proven track record in off-road racing with filters trusted by enthusiasts worldwide
- High-flow cotton gauze construction filters finer than paper while flowing more air
- Precisely engineered for exact vehicle fitment and reliable power gains
Frequently Asked Questions
- Q: Will HA-4099 fit my 2009 Honda TRX400EX or TRX400X?
A: Yes it directly replaces the OEM filter in both 1999-2009 TRX400EX and 2009-2014 TRX400X models with perfect sealing - Q: What material is used in this filter?
A: Multiple layers of pleated woven cotton gauze media provide excellent dirt-holding capacity and high airflow - Q: What is the warranty and service interval?
A: Backed by One Year Limited Warranty clean every 50 hours or as needed in dusty conditions for optimal performance
Shipping &. Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Protective box 8 x 6 x 2 inches
- Weight: 0.6 lb
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