For anybody looking for the original Ansa mufflers I did find this source.
http://www.fiatparts.com/ansa-fr.pdf
Take a look a page #9 of that .pdf
And if you are not familure with some of the modifications that can be done to improve the originals you should take a look at this link on the New England Pantera website.
http://panteraownersnewengland.com/big_pipes.htm
John
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