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The only comparison I can help with here is one between an
'01 Box and an '04 Box S.
Theses mufflers are not, let me repeat that, not the same.
You can look right through the '04, end to end (off the car,
of course). If you put a lens in it you could use it as a telescope
(albeit a rather heavy and bulky one).
You cannot do that with the non-S '01.
And the sound is not the same. The '04S has a very noticeable
sound increase (Which goes away at road speeds above about 50
or so on really smooth pavement).
That's not to say that the flow is better. These automotive exhaust
engineers are pretty crafty these days. It's my opinion that the
reason they can make these new cars quiet (or loud, if they choose)
is the large size and chamber design. They can be quiet and still flow
lots of air.
So there is sort of a non answer for you. They are different, they
do sound different, but do they flow differently? Ya got me, bub.
I suspect, however, that they flow just fine as they are and while
some might sound better or look better, it'll take a dynomometer
test to really know.
Ask Randall -- he knows.
All the best,
- Mark
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