Gary Wolf wrote:

Paul,
   In the attachment of the Mazda muffler with the too-small outlet pipe, I
see two tubes exiting and joining before the O2 sensor. Why two instead of
one with the same cross sectional area?
                                Gary Wolf

I have no idea. Did not make sense to me either :-) Just adds a lot of work.
The theory about these things is the pulse comes in at high speeds and whirls
around the inside wall of the can becoming homogenized in the process before 
finding its way out of the down pipe as an average near steady flow. Since the
flow is more steady than the original pulse it becomes quieter. At least
I think that is the way it is supposed to work. They do work. Tracy
has only one exit pipe as I recall.

Paul Lamar
 
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