The mini-pipe that comes with the Rossi looks kind of like a corndog. It has a round header pipe that connects to the exhaust port. Then a expansion chamber with another pipe at the other end for exhaust. Almost like a normal muffler. All it is lacking is baffles inside to reduce noise. Until the mailman delivers my engine, all I have to go on right now is some pictures in a review. The pipe they show does not have a nipple. I have seen some pictures at Morrishobbies.com. The pipe on their site does have a nipple. I guess I will have to wait until mine arrives.

Tom