China boasts several outstanding CNG conversion manufacturers. Here are some of the more prominent ones:

Sichuan Yuncheng Gas Equipment Co., Ltd., located in Chengdu, is one of China's largest manufacturers of LPG/CNG conversion equipment. 

Founded in 1999, the company has completed CNG conversions for over one million vehicles and exports its products to over 40 countries. 

With independent design and R&D capabilities, its products are widely recognized for their high level of OEM service, consistent quality, and low maintenance costs.