RE: A4 AND THE REST.

["Buchholz, Steven" <Steven.Buchholz@kla-tencor.com>]

What could be the case is that there is a significant enough reduction in
exhaust temperature between the inlet and outlet of the muffler.  Given the
universal gas law you can get the same mass down a smaller pipe if you
reduce temperature.  The motivation for dual exhausts is to provide a
greater cross sectional area for the exhaust to pass through without having
to go to a larger diameter pipe.  Do you know if the outlet diameter on that
first muffler is larger than the inlet pipes?

There are a few Audis which do have dual exhausts all the way through.  I
know the 200q/20v has them as does the V8.  Since they connect together at
the resonator/muffler (at least on the V8, with which I am more familiar) it
is my assumption that the dual pipes are there only to provide the
additional cross section, each exhaust is not individually tuned.  

Steve Buchholz
San Jose, CA (USA)

> ----------
> I've been shopping around on the net and elsewhere, and I'm wondering why
> there isn't an aftermarket, "true" dual exhaust made for my A4 and other
> euro's for that matter? My car has true dual exhaust past the cats. till
> the
> first muffler and then into one all the way back to the outlet muffler
> which
> has dual tips (common place). Any suggestions as to why? I know this isn't
> a
> Chev but you would think that w/ true dual and maybe an "H" pipe before or
> after the cats. they could produce more power from the engine.
>