[s-cars] S2 Muffler for tight fit/clearance

[Ben Swann]

Has anyone toyed with using balance pipes - I'm thinking of a kind of setup  for large
single that couples in a small exhaust section behind the cat and dumps back in the
system  a few feet back - with proper length, ought to provide some "noise cancellation,
can be routed for low clearance and even have a resonator.  Some inline couplers with Y
out and one back in. 
 
Ben

  _____  

From: Peter Schulz [mailto:p.schulz at verizon.net] 
Sent: Tuesday, November 16, 2010 11:28 AM
To: Ben Swann
Cc: s-car-list at audifans.com list
Subject: Re: [s-cars] S2 Muffler for tight fit/clearance


Ben: 
this may help...from the personal archives....
And I'll be in the same boat if I ever actually FINISH my eS2.

Note the date...

-Peter


From: QSHIPQ at aol.com

Date: February 22, 2001 12:06:12 PM EST

To: "Audi 20V" <audi20v at rennlist.org>

Subject: [audi20v] RE: Custom exhaust tuning... help needed

Reply-To: Scott Justusson <qshipq at aol.com>


Common problem, turbo or N/A I5 Audis.  The mid muffler is what tunes out the 
resonance at highway speeds, however it also sucks midrange and highend 
power.  A couple of things you can do:
Put the cat back in, it also muffles sound.  High flow cats are best for 
this, I've found good luck using 3in cats on 2.5in systems (this brings the 
"urgent" tone down).  This also works in the center muffler application.  The 
best muffler for the center in terms of height and clearance is the 12in 
Borla XR1.  Again, going with the 3in version of this will create a lower 
tone, and really address the midrange drone, without sacrificing power.  As 
far as the rear muffler, I use the Borla (expensive) or the walker dynomax 
(best b4b) ultraflow.
As for what you have stock to work with, I haven't had a lot of luck using 
any "glasspack" type mufflers in the audi I5, they don't really do much in 
terms of quieting this unbalanced motor pulses.
As a rule, deleting the center muffler gives you great gains in midrange and 
high end flow, but *always* at the expense of the sound right where you drive 
the most often (a subchapter of Murphy's law applied to audis).  

HTH

Scott Justusson
QSHIPQ Performance Tuning
Chicago
'87 5ktqwRS2 10vt w/ 3in turbo back exh, 3in high flow cat, 3inxdual2.5 borla
'87 4Runner turbo w/3in turbo back exh, 3in high flow cat, hooker turbo 3in 
'84 Urq - formerly with 3in turbo back scorpion (dual muffler) w// 3in high 
flow cat
'83 Urq - stock rear and cat, flowmaster 2.5in center muffler
'85 FJ1387 - SS headers, supertrapp exhaust w 8 plates ;)




On Nov 16, 2010, at 10:46 AM, Ben Swann wrote:



The 3" 034MS system  I installed on the E-S2  has no center muffler - only rear muff.,
3" Cat and is far too loud.  I'm sure it can be quieted with one or two well placed
center mufflers, muffler/resonator (resomuf?).  The problem I forsee is the lack of
clearance or space to locate it without interference with underbody or driveshaft. The
3" system already has clearance issues.  Cat rubs against the tunnel near the downpipe
and continues to hang too far right, but does fit OK over the shaft with some playing.

The original setup on the car as I recall had a large center muffler offset to the
passenger side under the rear seat.  That option won't work because it's where the
battery is being relocated.  Besides and inline unit will flow better.  I ought to be
able to locate one somewhere in/under the driveshaft/tunnel aft. of the U-joint to
somwhere where it opens under the seat.  One side has only 1" clearance, but I can
increase that with adjustment/shifting and proper hangar.

I considered some suggestions like Magnaflow 14219 and similar, but I don't think they
will fit well.

A unit that is narrow (8") with offset would be ideal, or an inline unit with diameter
under 6" ought to fit.  Seems a good size would be 8" (maybe 9") X 12" to as much as 18"
long.  This as long as the offset allows as little as 1" clearance on a side and top.
Height can be around 6" as long as there is about .75" room to clear under the
driveshaft and could hang a bit under the tunnel, but don't want to be hanging low -
like the dogleg one sees on every Camry.  An Oval shape might be easier to fit
optimally.

Stainless is a must and ideally look good.  Picky aren't I!

Just seeing if anyone has dealt with this and has good recommendations or alternatives.
I'd really like the car to be reasonably quiet in spite of the 3" overall diameter of
the system including downpipe.

TIA Ben
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-Peter Schulz
Chelmsford Ma, USA
http://www.naaclub.org/

1995.5 S6 Avant Emerald/Ecru
1995.5 S6 Avant Silver/Platinum
1991 90Q 20v Q Red
1991 90Q 20v Indigo
1991 CQ silver  (eS2 recipient)