Thanks for the visual on your idea. I like the idea, but I turned the outer ring inboard to help retain insulation better and that would make it harder to ensure that a line type clamp was aligned and grabbing. Also, with the cup inboard it would be only friction holding the baffle, and I'm a bit concerned that the continual heat & vibration would allow it to slide free. I'm sure it could be made to work, but I'm not sure I'd ever be 100% comfortable that a baffle wasn't going to be bouncing down the highway behind me.

After sleeping on it I think I'm going to weld three long "tabs" to the outer side of the baffle ring spaced equally @ 120*, extending close to the end of the megaphone, say 3/16Tx1/2Wx(length to fit). Because of the exhaust port orientation and my suicide door clearance issues the passenger side megaphone is almost 3" shorter than the driver's side (ports sit E/I front to back drivers, and I/E front to back passengers) which makes the baffles different - same sound attenuation length, but different projections. This means the old mounting hole is too far forward, and will have to be welded and ground smooth before the headers are recoated, and this method will make both sides look the same from the outside.
Baffles 018.JPG

I appreciate the idea of the clamp, and had I turned that ring around like the old one was I'd have used it for sure. It's stored away for the next set