Keep your heavy-duty truck engine running reliably with this premium replacement air filter. Designed for direct fitment on Kenworth T800/W900/W900L, Peterbilt 378/379/388/389, and Western Star 4900 models. Replaces OEM & aftermarket numbers: LAF3302, AF25248, RS3534, 6863, CA8231, P534925. This heavy-duty air filter delivers high-capacity filtration to block harmful particles, reduce engine wear, and maintain consistent airflow for better performance and fuel efficiency. Built tough for long hauls, rough terrain, and dusty job sites. Installation is quick and straightforward—no special tools required. Always verify your vehicle model and part number before ordering. Contact us for fitment support.