As I mentioned in another post, since the stock pipe is quite thick in the silencer mounting area, I sanded the excess thickness off with a belt sander so I could get the equal sized adapter on! Worked like a champ! I tried one of those "Tube Expanders. Don't bother, it didn't do much expanding. I flared the end a little bit so it was some assistance getting the adapter started, but in the end the sanding was required and did the job!
When you decide to start doing this kinda stuff, you'll find that none of it will go as you originally hoped. You have suddenly become a custom vehicle builder with all the little weird stuff it takes to make non fitting parts work. It keeps the work interesting! And teaches you a lot about metal working and other fun customizing tasks. Also patience. If you don't have that, don't get into wanting to make it your own machine, because if you finish it It will be yours and nothing else is going to fit! Or if you botch it up, try to figure another angle of attack.
Bare