1. Replacement: The 42mm Air Filter Stack Kit is specifically designed as a replacement for 2 Stroke 47cc and 49cc engines, ensuring optimal performance for your mini pocket bike, kids ATV, and gas-powered scooters. 2. Enhanced Performance: This air filter stack kit improves airflow to your engine, enhancing combustion efficiency and maximizing power output for an exhilarating ride on your favorite mini pocket bike or ATV. 3. Construction: Made from materials, the 42mm Air Filter Stack Kit is built to withstand the rigors of off-road use, providing long-lasting reliability for your gas-powered scooter and recreational vehicles. 4. Easy Installation: Designed for hassle-free installation, this replacement kit allows you to quickly upgrade your 2 Stroke 47cc and 49cc bikes without the need for tools, you back on the road in no time. 5. Versatile Compatibility: Perfect for a variety of applications, the 42mm Air Filter Stack Kit is compatible with many mini pocket bikes, kids ATVs, and gas-powered scooters, making it an essential upgrade for any small engine enthusiast. For: 43-49cc For: 40-5 Color: Red Material: Metal Package Contents: 1 x 42mm Air Filter Stack Kit Replacement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.