I received my GY6 header and modified it to fit the bike. Look at the attached pictures of the modifications.
I had to remove both ends. The muffler end had a flange with three holes and the end that goes to the engine had to be cut out and re-welded. Noticed how I used epoxy to hold the flange to the pipe before welding. This allows me to properly align the flange and pipe correctly to the engine exhaust port.
I have a video but I am still trying to figure out how to load it. Nine pictures were uploaded but looks like only one is showing