This question has been a source of controversy for many years.
I have never seen a set of NOS extensions, but I've been told that they came with an adapter pipe so that you would cut your stock pipes, install the adapter pipe then the extension.
Somewhere, maybe in the '67 accessory brochure, there is a picture of them turning slightly downward and outward similar to the way the stock pipes exit.
The consensus I've heard is that straight out the back is not correct. However, that seems to be the way many people install them.
I hope I have confused everyone, including myself.
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Bob Kazian
Taylors, SC
[email protected]
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