Old Library

I have a Supersprint that came with my 325is.  It is one of the only
aftermarket systems that has been confirmed in testing to make a
difference in hp.  Really nice mellow sound with a roar at high rpm, not
loud and boomy like others.  Aluminumized with fiberglass damping.
Check out www.supersprint.com

Gary
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From: xjosh &lt;&#120;josh&#64;one<img src=/i/dn.gif border=0 width=35 height=15>&gt; wrote:
>I don't expect you would experience any difference but sound
>(and appearance). The system as a whole, as I understand, is
>pretty free-flowing. The muffler is probably the least of any
>restricion, and I suspect that an aftermarket muffler would be
>similar. Net: no difference. My opinion is that you're better
>off spending the money on other mods that improve performance,
>drivability, or comfort. Maybe get a tape of someone else's car
>with a different exhaust and drive around with it playing. ;)

While I agree with Josh that the factory system is quite good I do 
have to disagree that there is no gain from a aftermarket one. We 
have tested and installed our system on at least 10 different VR6 
models and we have gained power on every one. Some more than others 
but always at least 4-6 gain. Sure it is not a earth shaking power 
gain but it helps in the total picture of things. 

We even had our system installed by a third party along with 
another well know system and ours showed a good gain as well as 
fitted with no problems. What they found on the other I would rather 
not say. Again it was only 1 test for them so that is why I have 
tested ours over and over again. Many times we even offer to 
dyno it before and after for a customer. 

Now there are many systems out on the market and I can only speak for 
ours as we have not tested many of the others but I would suspect 
that many do offer a power gain. 

One of the secrets is not to loose any power on the bottom and at the 
magical 4k area. This is why people notice a lost of power with 
removing the center muffler as well as the very loud sound. Our 
system was a little too loud and had a slight resonance at a certain 
rpms. We redesigned it and used two mufflers to cure it and without 
any lost in power. 



&#116;urbotim&#64;newdimensions<img src=/i/dc.gif border=0 width=35 height=15>
http://www.newdimensions.com
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In a message dated 98-02-20 10:13:24 EST, &#97;qn&#64;dev.tivoli<img src=/i/dc.gif border=0 width=35 height=15> writes:

<< Can you please clarify (to the list) on whether the system that you
   have is cat-back or headers + cat-back?  (I'll be doing engine mods
   this year, so I am intensely interested.)  Thanks. >>

I have the revised ND single tip, double muffler, cat back Borla exhaust(boy
is that a mouthful!!!). Heres how it did on the dyno. The only other mods on
the car are p-flo and p-chip

RPM   stock   Borla  CHANGE
2000      48       48         +0
2500      64       63         -1
3000      79       81         +2
3500      96       98         +2
4000      113    117        +4
4500      130    138        +8
5000      142    152        +10
5500      155    160        +5
6000      151    162        +11
6500      140    160        +20???? I don't know what happened here, or if I
believe it. I can tell you this though, before the exhaust the car just
totally ran out of power at 6k and after the exhaust was put in it pulls
strongly all the way to the rev limiter. While the ND system doesn't have the
stylish duel dtm type tips, It looks good, the quality/fit/finish are first
rate, and the gains in power are real

Jim

All,

Regarding VR6 exhaust systems: The ND system (twin Borla, 2.25") is a good
option. I've seen the dyno results of a '92 SLC, and was impressed.
Empirical data: about 12ft lbs of torque in the mid rpm range, about 10-12
road hp gain at high rpm range.
Impressive, considering the diameter is only 2.25". Sounds nice under
throttle; idle sound is humble. I haven't seen the dyno chart for a GTI
system. Gains are probably equal or superior to the Corrado system. Thus
far, I haven't seen any VR6 cat-back system even approach those gains.

Jason
'93 SLC


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