The update is Here! The update is here!

Just received the exhaust expander tool-a-ma-bob. So now I will engage my hopefully final, plan of attack! Wish me luck ...
I've changed my mind. I decided to use the plumbing pieces agian, but this time I expanded them and bought some special high temp steel stuff to help them stay in. I had to drive them in, so hopefully they will stay in place this time.
This didn't work either. They broke loose and began to rattle. I decided to buy some 1-1/2" pipe at the auto store, cut it into two lengths 6" long. took them to a welding shop & had them tig welded into the modded exhaust. This works great! Plug color is good and the sound has been found!