This air filter is specially designed for GY6 scooters and ATVs, belonging to the category of air filters. It is well - designed and comes with various compatible specifications to meet the needs of different users. In terms of connection, there are multiple options including 35mm, 38mm, 42mm, 45mm, and 48mm for connection threads, seal ring sizes, inner diameters, intake pipe diameters, and exhaust pipe diameters, ensuring a closer and more perfect fit with various vehicle models. It has two types: straight - mouth and slant - mouth, which can adapt to different installation environments and usage scenarios. The flexible design makes the installation more convenient. Regarding the external dimensions, it has a 45mm caliber, a width of 100mm, and a height of 120mm. The overall outer diameter × height is 12x10cm. This size design not only ensures the efficient filtration of the air filter but also doesn't take up too much space. As a motorcycle modification accessory, it features high flow, capable of providing sufficient clean air for the engine. This helps improve the performance and efficiency of the engine, making the vehicle's power output smoother and bringing a better riding experience. Whether for daily riding or traveling on special terrains such as beaches, it can perform excellently. It is an excellent choice for enhancing the performance of GY6 scooters and ATVs.