I used the pipe on a custom CB100 build that I installed a Zongshen 250CC engine on. The fit is perfect for my needs. The overall quality is good. Chrome plating looks excellent. Pipe has a slight restriction due to a piece of triangular tubing that is inside the main pipe. It cannot be removed. I'm assuming it is there to keep the pipe from kinking during the bending process. Diameter is fine for a 250cc and below. This pipe will work on Zongshen/Lifan/Shineray, 250cc and 200cc swapped bikes.
I'm very satisfied