I have four mystery moto pipes here. They came from SSC Racing so they’re quite old. They’re hand-made, one is marked “Mogo,” another is marked “MRE,” and there’s a mounting tab that looks like it would bolt to the top of a head. The inlet size would seem to indicate 125cc and their layouts look like they would be for a left-side engine.
Looks like some old prototype modified Honda stuff. Tim Pappas did was or is MRE. I think he had a local place (Aircone) here in Las Vegas make the pipe to his specs. He also liked to have them coated with this ceramic high temp power coat that was supposed to hold the heat in.