That’s great customer support! You might want to test a piece that you don’t need, just to make sure there’s no recurrence of the shattering. Better safe than sorry!
Peter
Great suggestion although I am pretty confident they will be fine

RAGIII
I'm a bit late to the show here. Could you tell me what sized tubing you used for the exhaust? I have one of these partially done and have been thinking of getting back to it and finishing it. I need to figure out the exhausts though and your fix looks easy enough. Thanks in advance.
James
My simple solution worked out well. If you look up the pipe without using a flashlight all you see is a dark tube. With a flashlight a dark tube ending in a blanked off manner

I measured the tube and oddly it is @ 14 mm Outside diameter and @ 12 mm inside diameter. IHTH,
RAGIII