Identify This Header For 750 Twin?

Here are pictures of the headers and can I got back in 1982 for my KZ 750 twin. I bought them from JC Whitney, don't know who actually made them. The baffle is a steel tube with small holes swiss cheesed along the length with a blocking wall in the middle so the exhaust goes inside the tube on the header end, expands out into the chamber then is forced back through the small holes out the center of the tube on the exit end.

Makes good HP from about 3K to redline, needs a little larger jets on pilot and main. Not unbearably loud at light throttle openings, but really howls when you crank it wide open.

One picture

duplicate post

another pic