1. Applicable models: GM
2. Height: Small size is about 12.5 cm, medium size is about 15.5 cm, and large size is about 17.5 cm
3. Bottom diameter: about 13 cm
4. Caliber: about 60/63/70/76 mm
5. The gate installed in the engine's air intake system
6. An assembly composed of one or several clean air filter components
7. Main function: filter out harmful impurities in the air that will enter the cylinder to reduce the early wear of the cylinder, piston, piston ring, valve and valve seat
8. The intake air flow is large, which is more common in modified cars with upgraded power
9. Note: use small size for displacement below 1.5, medium size for displacement 1.5-2.0, large size for displacement above 2.0