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

[Peter Schulz]

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)