[grimlock]

Tried to yank it off, but didn't want to rip the whole muffler off, so use some WD40 with the straw. Squirt some in between the tip and pipe from behind, twist it a little and it will come off easily.

The tip is slanted cut circular, external 73mm diameter, 98mm long.
The attachment pipe is circular ~64mm. (Its larger on the outside, the narrower part close to muffler is ~55mm.)