Re: 1993 90CS

[ejfluhr@wc101.residence.gatech.edu]

>I was warned that the Audi 5cyl relied on the back pressure from that
>center muffler to operate properly.  Can you elaborate on your experience.
>The center resonator provides some back-pressure to help with low end
>torque. Removing that might take a little "ooomph" out of the lower revs of
>the engine.
>How far off from reality am I? I mean with this answer.
>Ernest Wong

That is certainly what I have experienced.  I put an exhaust system from
Eurorace on my '85 GT over a year ago.  It consisted of a larger diameter
pipe from the catalytic converter, to a Walker Dynomax that sits in the
general vicinity of the middle resonator, and then another pipe that 
goes over the axle to the dual tips sticking out from the bumper.
I have noticed quite a reduction in low-end torque (around 2K-3K rpm).
However, where the engine really didn't pull well when revving above 4K,
now it pulls strongly until well over 5K (I don't test it very much over
5K, but that 4k+ difference is definitely nice).  The engine seems to have
converted that low-end torque into high-end power.  I always enjoy
driving my Dad's '81 coupe (110hp engine), because he still has the
original muffler style and his engine feels quite different.

Later,
Eric