Zhejiang Feishen Vehicle CO., LTD is a factory in China that makes all kinds of gas powered vehicles from 4 wheelers to RC cars. Zhejiang Feishen Vehicle CO., LTD RC department is called FS racing
The CEN RC chain is either another Department of the Zhejiang Feishen Vehicle CO., LTD or they contracted Zhejiang Feishen Vehicle CO., LTD to produce RC cars for them. They did have them change the upper and lower arm setup on the CEN matrix range. Apparently better quality control can be assured because it comes from the CEN department, Many complaints about the FS racing vehicles was the differential pins snapping and binding of the differential gears. CEN seems to have sorted those issues out with better materials. I have not heard complaints as of yet about the quality of the CEN 1/5th lineup.
This is a exploded diagram of the FS racing 1/5th scale vehicle.