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> I am wondering if the oval you are talking about could be the cut angle of
> the end of the exhaust pipe.
> Scott
Hard to believe that could improve performance.  You have effectively
reduced the area through which the exhaust gases can exit.  That would
likely increase backpressure.
Matt
Scott / Matt -
I hadn't worked out the math, but yes, intuitively, I can see that
the pipe area is slightly reduced. However, if  memory serves me correctly,
the exhaust backpressure was reduced in spite of the area reduction. I
believe that is was just a phenomonea resulting from the shape of the
exhaust gas as it exited the tube. I won't post any more on this, unless I
can again find the information. Just thought someone might be knowledgeable
of this one way or the other.
Bill Rumburg
N403WR  (Sonic bOOm)
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