Originally Posted by
Jaz240
Three chamber refers to the three different sizes of the pipe, if you notice it is tapered from the header to the stinger, that is what they mean by 3 chamber, the inside of the pipe is empty. I thought it was very strange also, since it has no interior baffle system, but that is the way its made, and nothing wrong with your pipe.
Uhm, not quite. A three chamber pipe is three chambers.
Chamber 1. The divergent and convergent cones. This would be the expanding cone the exhaust first enters and then into the convergent cone (often has little oil drain holes drilled into it, shine a flashlight down in there and you can see it).
Chamber 2. This is basically a can shaped cap that goes over the end of the pipe. The hole in the middle of the convergent cone empties into it. There is a hole in the side of this cap where the stinger is attached to form the outlet. In a two chamber pipe this would be it.
Chamber 3. This is basically just a big washer that is welded over the end of the convergent cone and inside the end cap. It blocks all the exhaust gas (and sound) from even getting to the stinger except it has a small flat spot on one side to let the gas escape and as such forms a third chamber within the pipe. You will not see it without cutting open the pipe.