Protect your ATV air filter with the OUTERWEARS ATV Pre-Filter, designed for use with K&N HA-4504 air filters. Manufacturer part number 20-2077-03 and vendor part number 25-5837R identify this replacement pre-filter for off-road applications. It fits 2004 and 2005 Honda TRX450R models, helping provide an added layer of protection during riding in dusty, sandy, muddy, and wet conditions.
Made from silicone-impregnated micro-mesh, the OUTERWEARS pre-filter is water resistant and engineered to help prevent unwanted contaminants from reaching the primary air filter. The material uses uniform micron-sized openings that allow air to pass through while filtering sand, dirt, clay, and water. It can filter particles as small as 0.005 inches in diameter without noticeable airflow restriction.
Dielectrically welded seams provide a durable, secure construction suited to demanding ATV use. Dyno and flow bench testing has shown no significant horsepower or air-intake loss when this pre-filter is installed. This helps maintain the performance characteristics of the K&N HA-4504 filter while extending protection between routine air-filter services. Verify the existing air-filter model and vehicle application before installation.
Features:
- Fitment: Fits 2004 and 2005 Honda TRX450R ATV models
- Compatibility: Designed for use with K&N HA-4504 air filters
- Brand: OUTERWEARS
- Manufacturer part number: 20-2077-03
- Vendor part number: 25-5837R
- Material: Silicone-impregnated micro-mesh with water-resistant properties
- Filtration: Filters particles as small as 0.005 inches in diameter
- Protection: Helps filter sand, dirt, clay, water, and other unwanted elements
- Construction: Dielectrically welded seams for durable performance
- Airflow: Designed to provide filtration without noticeable airflow restriction
- Testing: Dyno and flow bench testing showed no significant horsepower or air-intake loss
Fitment:
2004 Honda TRX450R
2005 Honda TRX450R