more questions about RE: Custom exhaust tuning...

[Lawrence C Leung]

If you find out a good virtually silent one, let me know!

LL - NY

On Thu, 22 Feb 2001 12:33:30 -0500 "Beatty, Robert" <BeattyR at ummhc.org>
writes:
>Scott or anyone else for that matter,
>
>I'm looking at buying Stebros exhaust for my 87 5ktq or putting a 
>custom
>system in as the stock system is needing a new muffler anyways and 
>since i
>have chipped the car, the exhaust is something i want to do anyway.  
>Do you
>have any experience with the Stebro system on the 5k and how is it as 
>far as
>noise goes?  I do NOT want a loud riceboy exhaust, I just want more 
>power
>out of the car, it can be totally silent for all I care.  Anyone have 
>any
>btdt?
>
>Thanks in advance
>
>Rob
>
>-----Original Message-----
>From: QSHIPQ at aol.com [mailto:QSHIPQ at aol.com]
>Sent: Thursday, February 22, 2001 12:06 PM
>To: spokes at mail.the-wire.com
>Cc: audi20v at rennlist.org; quattro at audifans.com
>Subject: RE: Custom exhaust tuning... help needed
>
>
>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 ;)
>
>
>