I could not find any pictures, nor a drawing of this option on the Net. As you can see on this picture, my '68 Vette does not have common mufflers. They have a nice sound though. Could somebody tell me if those are the "off road exhausts" N11 option. This option was available only on the '68, before GM switched to the side exhausts in 1969.
Your help is appreciated

[IMG]local://upfiles/3408/190A68B8A52E456D943FE3B004CA5080.jpg[/IMG]

 

They look like glass packs. I bet it sounds cool.