<<I concur. I'd consider $150 a small price to pay to drive away with
clean hands and most of my weekend still ahead of me to do with as I
please. Even if I had a rack and a torch, I'd be tempted to let someone
else deal with exhaust wrestling. I find it to be the most thoroughly
unfulfilling class of automotive repair. Changing an exhaust system is
full day guaranteed to bombard you with as many rounded bolt heads,
buggered nuts, broken studs, and general stuck fasteners as it can. I
say hand it off to the guy who's getting paid to do it.>>

John,

Other than doing a complete hose change the exhaust system is possibly
the most unsavory, eye filling with garbage, knuckle banging, crummy
jobs on a Vanagon.

I think you'll be much happier having the exhaust people ( much like,
and similar to the Clay people )  do the job.

Just hope and pray they don't screw it up.
(Ahh, but it's under warrantee)

You should be glad they aren't greedy and are accepting the parts you
have to install.
Some shops won't .