China Manufacturer Car Conversion Kit 4 Cylinder Gas Lpg Injector Rail for Injection System.

Chengdu CNG LPG Conversion Kit.

Advantage of CNG fuel:

Significant reduction in exhaust emissions. Compared to gasoline, the toxicity of hazardous pollutants in exhaust of CNG is much lower.  

CNG emissions are also better than gasoline considering the reduced ozone emission.