I'm willing to bet this ring is what's still holding yours together. On mine there is a wire ring about the thickness of a coat hanger that fits into a groove in the canister. The groove is right at the edge of the core, and with the ring in place the core will not come out. You should see what I mean if you look closely at it. Just get a pick or something under one of the ends of it and pick it out, i bet the core comes right out after that.
If you don't see what i'm talking about, then it's possible that yours is built different than mine. I think technically the pipe on my bike is a White Brothers with Supertrapp discs but I was always under the impression that they were just Supertrapps sold by White Brothers, there's not even a White Bros logo on it or anything.
And back to the actual subject of this thread, looking good Tyler, definitely an improvement. Doesn't look beat up at all anymore, that thing did look thrashed.