Audi Technical Bulletin re: 2.8L V6 Exhaust Rasping Noise

["Greg" <mis@postoffice.worldnet.att.net>]

Please excuse me if this topic has already been brought up.  I searched the
archives for, "Exhaust and Rasping" and found no documents that contain
this recent bulletin from Audi of America.

I have been experiencing a "rasping" and, if you will a "spitting" noise
when my 97 A4Q is cold and under acceleration.  After research and a trip
to the dealer, I found a Technical bulletin on this issue I thought the
List might enjoy knowing about.  Here it is right from AoA:
-----------
Group: 26
Bulletin number:  96-03
Date:  Nov. 20, 1996

This bulletin supersedes bulletin number 91-06 dated 10/25/91.

CONDITION:
Rasping noise is heard (with cold engine) at end of tailpipe when RPM's are
increased.

Noise cannot be heard when engine and exhaust are at normal operating
temperature.

   The system is designed to reduce exhaust system corrosion by extracting
water condensation when the system is cold.

   This design feature may cause a noticeable change in exhaust system
noise level during engine/exhaust system warm-up

SERVICE:

If a vehicle exhibits this condition:

- Inspect exhaust system for leaks at clamps and fittings.

If no exhaust system leaks are found, DO NOT replace or attempt to repair
or modify any exhaust system components.
---------------------------------

Well, I hope this is/was helpful.  

Regards,

Greg Heidt
Noise and raspy when cold 97 2.8L V6 5spd manual in pearl