I've posted this before...just watched it again for the third or fourth time...
there are many videos about the Tumbler, but Jay Leno's Garage featured an excellent look at the car a few years back
including a test drive of the last driveable Tumbler in the US
(talking about actual screen used vehicles...there are of course, many copies out there)
https://www.youtube.com/watch?v=ydtGew7bWuw
Also gives you a good look at various exterior details.
Your exhaust parts look great!
The video gives some info about the "Jet" exhaust too.