I turned up a punch to rivet the pipe to the backing plate in my axle press.
Tip all done and riveted together ready for mounting.
Drilled 4 equally spaced holes.
Spotted them through to the muffler, drilled and tapped.
Quick coat of paint and back together, all up around 4 hours work. Looks pretty good, if I do say so myself.
Most importantly though goes and sounds much better, well worth the effort. Just got to get some stainless socket head screws to finish it off nicely.