4kq exhaust manifold

[Mason Bender <mbender@freenet.columbus.oh.us>]

Dear Quaatrophiles-

I was under my 86 4kcsq for an oil change, and I noticed a part rusting
away, and am looking to get an ID of what it is.

It looks like some sort of a heat shield outside of the exhaust manifold. 
It looks like it was once held in place by the manifold studs.  There is a 
50mm (approx) hose coming off of it, and it looks as if it heads towards
the airbox.  A part similar seemed to be drawn in the Bentley manual in
the exhaust section, but it was unlabeled.  

Any comments or explanations are much appreciated.

TIA,
Mason B