Saw-Tooth Foam Design: Features a unique, patented saw-tooth pattern that provides up to double the surface area of standard filters, maximizing airflow and filtration efficiency. Enhanced Engine Performance: The high-flow design allows the engine to "breathe" better, improving airflow, throttle response, and potentially increasing horsepower and torque. Superior Sealing: Utilizes a 12mm ultra-soft foam seal to ensure a tight, dust-proof fit between the filter and the airbox, preventing dirt and contaminants from bypassing the filter. Durable Construction: Made with flexible glue seams and high-quality, long-lasting materials that resist becoming brittle and cracking over time. Clean and re-oil in minutes, saves you hundreds vs disposable OEM filters over the life of your bike Unleash full power on your modern Kawasaki KX with the O2 Rush filter. Patented Saw-Tooth foam doubles surface area for extreme dust protection while flowing more clean air than stock. Ultra-soft sealing lip creates a perfect airtight seal. Pre-oiled, fully washable & reusable – the exact filter trusted by factory race teams. Direct drop-in replacement for OEM 11013-0766.