Can someone help explain the pipe I need?
It would be to connect a 3" exhaust pipe from the stock y-pipe to my 3" cat-back.
I think it would have to be:
3" Pipe
with a 3" ID and 3" OD (or ID) on the ends?
ex:

I hope someone knows what Im talking about
What im trying to do is cut out my stock cat with a saw-zall. Â*And connect both ends with a 3" Test-Pipe, and clam the two ends down with band-clamps, so that the pipe can easily be swaped out or removed.