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Chris,
If I remember correctly you have a Renesis. After hearing
Dennis's run-up to 5100 rpms last week I am planning to use the same muffler he
has. Here are the specs he gave me.
Hushpower II
Flowmaster Performance
Resonator
12512400
2.5 in. inlet/outlet
409 SS construction
This
little muffler sounded much deeper and quieter than I expected. No level
measurements but it was not unpleasant. We are both modifying the stock exhaust
manifold but are trying two different methods of attaching the muffler to
it. Will it hold up is another question.
Bobby
(engine
still under sheetrock mud) :)
I've looked back through the archives, and seen
lots of different ideas for exhaust systems. But no real definitive
answers.
There is the Cool tube exhaust that has very short
pipes,like Bob White posted.
There is the medium length, no muffler system like
Buly has or like Joe Hull has mocked up.
There is the really long tubes with muffler hanging
under belly like Tracy has.
Do we know what the correct length tube is to tune
the exhaust for our RPMs? Does this length include the
muffler?
It appears the diameter most used is from 1.5 to
2".
What about the different mufflers? I
only found two mufflers named in the archive that guys are happy with, the
Flowmaster Hushpower II, and the Moroso Spiral Flow Racing Mufflers.
Last year at Shady Bend, Monti talked about noise levels
and testing different mufflers and pipes. Are there ant results from
that?
I'm ready to start mocking up my exhaust, so am
seeking the collective wisdom of the group.
Chris
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