Thank you to everyone who has (or may) chime in. Just to answer a few
When I said "Boomy" I meant the resonance was so pronounced it was
disturbing to deal with. Maybe it wasn't the best of terms.
I think in an open Tiger noise is more palatable than in an enclosed car.
On this car (Plymouth Valiant) a single exhaust is easier to snake by the
gas tank. That is why I chose to use it.
The 3" (7.07 sq.in.) single exhaust is about equivalent to dual 2-1/8" (7.16
sq.in.) pipes. That doesn't seem to be over kill there.
An "H" or "X" pipe is irrelevant in a single exhaust. Within 2 feet of
leaving the exhaust manifolds the are constantly merged.
Ironically it is only at about 4-5,000 RPM that I notice a minor gain in
performance over the choked down, single 2" pipe and stock muffler I
originally was running. Ugghhhh, I won't tell of the "days" of labor I spent
putting this together from a bunch of stuff I had lying around. I really
though with the merged single exhaust and the three chamber 50 series it
would be quieter, but then I have been wrong before.
Thanks again everyone for the input. We can now return to our drama "Tiger
bidding on Ebay." :-)
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