Gary,

Why in God's name would you want to take the time to install a "used"
exhaust collecter, and Cat?

It's not a hard job, but Buy Junk---Get Junk!

How long do you think a used set-up would last?

Day?
Week?
Month?

I would be awfully hostile, if I went to all this trouble installing a
used exhaust system, and it fell of or rotted off a week later.

Un-zip the mattress, and contact one of the list venders, for new
stuff-----------
You'll be happier in the long run !!

Later,

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Terry 85 GL