Yes- Great Lakes Pantera in the greater Chicago area. The next closest POCA Chapter is in Dallas-Ft Worth, TX or Eastern Pantera in New England. There may be smaller local, unaffiliated groups that we don't know about.
Found it! 
And I have to say I am very surprised that i found nothing related to that topic here.
The chirp came from the perforated inlet in the tailpipes. The space between this tube an the outer tailpipe originally was filled with damping material, which burns out over time.
And because the tube itself is only welded on one side (towards the muffler), when the stonewool (or whatever it is) is gone, it can freely move, which it does unfortunately.
The chirp is gone after removing the perforated tube.
In this link you can hear the chirp on the third Pantera in comparison.
https://www.youtube.com/watch?...channel=laurent91400
As always: sorry for my bad english
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GeorgS - thanks for the follow-up. Were you able to hear the loose inlet pipe when banging on the muffler?
My chirp noise appears to be acoustic vs. a rattling internal part. I can control the sound by blocking one of the outlet pipes and, I need to verify this, but I also think I was able to control the chirp as I was adjusting the idle mixture on a new carb. As I was richening the mixture, the chirp seemed to go away???
I had the same problem whit an other car, after a lot of investigation , replace the whole exhaust system , check the webers, sparkplugs a.s.o. I found out that when I slide inn a steel pipe into the chrome tips the crispy sound was gone .
the problem also was the perfored pipe .
Simon
No, banging against the muffler had no effect.
I made a video of testing with steel tubes inside the tailpipes ( seems like Simon did the same).
You can hear me talking in German but it doesn't matter, I state the obvious: "noise is there" and "noise is gone", watch till the end, you can see that you don't even need the tubes.
I am sorry Rob, I see you live in Michigan, that is a bit far to take a quick look.
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GeorgS - thanks for the video - sounds like my problem! Do you have any pics of how you removed the perf pipe?
I'm checking flights to Munich!!
Way back when we first bought our '72 in 1980, one stock muffler 'jingled' at idle. Turned out that ANSA had added a "final baffle" inside each muffler by tack-welding a steel washer inside the muffler onto the perforated outlet pipes. And in 8 yrs of driving, the tack-welds broke in one side, freeing the washer to fall into the muffler case to rattle around.
Cutting a little hole in the case allowed enough access to dump the thing out. Then I took a piece of steel pipe and stuck it in the still quiet muffler outlets. A sharp whack on the pipe end easily broke those washers off too and I removed all of them the same way. The noise increase from the four broken 'final baffles' was un-noticeable.
IMHO, anyone not rather well to-do that owns any Italian car and does NOT own a large selection of tools, welding equipment and a lathe, is fighting an uphill battle if he/she expects to drive it regularly! Sure- there are shops that do this stuff every day.... at $80-$125/hr. And they have waiting lists.
Jack - amen to that! In the 6 months I've owned my Pantera I'm sure I have saved thousands by being able to DIY. Unfortunately - no metal lathe - but I do have a wood lathe - hmmm - maybe a custom shift knob??
I have been getting some satisfaction closing out the open issues on my Excel doc - and some frustrations on a few things - but it is worth the battle!
I started DIY because I was a married College student put thru school by parents & wife, so simply couldn't afford to hire a talented shop to do what I thought was necessary. Now I own a small but complete machine & welding shop in my back yard! Can you say "Mission Creep?"
I cut/sawed the tailpipes behind the original weld (see picture).
But don't cut them off completely, or you will have a lot of fun welding them back on in the correct angle.
I just cut as far as I had to till the perforated tube could be removed.
Then welded everything back together, grinding and sanding fun and at last painting it black again.
And yes I have to agree, if you are not able to help yourself, it will be very difficult to have fun with these cars. The problem here is, that there are no talented mechanics that I trust enough.
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As an alternative to removing the perforated tubes, Ansa GTS Exhaust chirping can also be eliminated by covering perforated tube holes.
I purchased four 8" sections of "Mild Steel Round Tube 1026 (DOM) 1.500 X 0.065" from Metal Supermarkets (local pickup $35.83 all in), inserted these solid tubes inside the perforated tubes, secured with 1/2" long #8 sheet metal screws and voila - no more chirping.
I ended up packing some of the perf tube holes with permatex black goop. Sounds good now.