[s-cars] Exhausting Morning

[Tom Green]

Paul,

Now that you have "found" quattroworld's UrS4/UrS6/S2/RS2 forum, you  
can ditch this archaic method of getting timely answers.  Your issue  
there will be the opposite problem;  The
sheer volume of information will be difficult to keep up with and sort  
out relevant threads.

This thread may be helpful as well since it sounds like your cat may  
be shedding the parts:

http://forums.quattroworld.com/s4s6/threads/24025.phtml#272620

You should link with Jeff Postupack through your post on QW.  He is  
the middleman who has organized group buys from Stromung for the UrS  
car owners-the only way it is possible to buy one.
He has been involved in the development of the exhaust as well, and  
for the improved generations.

The good news is that the exhaust is indestructible except for the cat  
substrate as I suspect you are seeing.  The point being made by the  
other suggestions on the list is engine tune is the primary cause of  
cat failure, either from excessive oil burning (actually not burning,  
but passing into the exhaust from some source and causing the cat to  
have to burn it.  This coats the substrate with compounds in the oil  
and overheats it as well) or engine tune problems allowing excess  
unburned fuel to pass into the exhaust.  The change in sound of the  
exhaust and rattling indicates the cat substrate has broken up.  
Usually tapping the cat will give confirmation that something is loose  
in there.  Then it is a simple job to cut out the old and do a quality  
weld job on a new cat.  Some additional investigation to find the root  
cause is probably justified.

If the exhaust has gotten too noisy over the years, the mufflers can  
be repacked.  The casing should still be good as well as the pipe.   
Maybe shine up that exit tip while you are at it.  : )

Tom '95 S6
          '95.5 S6 avant
Knoxville, TN

OnTuesday February 4, 2014, at 10:11 AM,Paul Luevano  
<paul at clarity.net>  wrote:

> Peter Schulz wrote:
>> Paul:
>>
>> Check your 02 sensor -
>> seems like your car is running rich and some carbon is getting  
>> ejected?
>
> 	O2 sensor is < 2 years old.  I'll pull codes, but is *sounds* like
> there is something loose in the exhaust.
>
> 	Thanks.
>
> Paul