Everyone has one because of the name. It is massive in the race world and has a good rep on bikes and what not. Personally mine came on the blaster when I got it, had a chance to get another but decided to keep it because it is also quieter.
Now the piece you are talking about is a pain in the ass. Some people can cut the end off the old one rendering that old pipe useless and use that piece to connect them. I think you can contact FMF and get one that way, but be prepared to pay from them. Check ebay as well if you have the name of the piece. Might be on there. Get a new gasket just to be safe as well, even though you are talking about a different piece. Maybe a local exhaust shop could help you out too.