A new For Sale listing has been posted by 32special:

248 263 custom dual exhaust

The description for this listing is:

--------------------------------------------------------------

Dual exhaust for the 248 and 263 Buick straight eight. $240 plus $40 shipping. Made to order. Allow three weeks for delivery.
Rialto,CA 92376.

Will only work with stock intakes. Pm me if you're running a custom fabbed intake.

--------------------------------------------------------------