That looks like the identical one to the one I have from Walmart. . .
You can get it for $9.96 in store. I live in a small ass town and they carried it so I would assume almost any Walmart store w an auto department would have it.
Here is the link for the exact item. It fits very snug around the stock exhaust pipe and tightens down very nicely. I believe the diameter of the inlet is 2.25 inches and the outlet is 2.75 inches. I would not go with anything that has a smaller diameter inlet than this especially since there is a bend in the stock exhaust.
Also, here are a few photos of the tip on my titanium hatch. . .the last few photos are me showing off my custom done pinstripe :)