Hello Gents,
Very interesting thread.
Here is one solution that I like, for a dual out 3in. BB.
Take one of theses 2.5in. X 7in. flared ends
to fit into the 3in. BB, and slip in the assembly between muffler and end pipe.
Sound easy, will let you know if it's working...That's going to be next spring,
the car is in hibernation.
Regards