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Info: General exhaust systems info

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Re: Subject: [gti-vr6] Exhaust AWE16VR6@aol Wed, 2 Dec 1998 12:55:59 EST
Re: Subject: [gti-vr6] Exhaust "Richard Adams" <richard_adams@launch> Wed, 2 Dec 1998 13:06:51 -0600



From gti-vr6-owner@dev.tivoli Wed Dec 2 12:01 CST 1998
From: AWE16VR6@aol
To: Manny.Rodrigues@usa.xerox, gti-vr6@dev.tivoli
Subject: Re: Subject: [gti-vr6] Exhaust
Date: Wed, 2 Dec 1998 12:55:59 EST
 
In a message dated 98-12-02 12:16:14 EST, &#77;anny.Rodrigues&#64;usa.xerox<img src=/i/dc.gif border=0 width=35 height=15>
writes:

<< <<Date: Wed, 02 Dec 1998 09:55:25 +0000
 From: ben t &lt;&#105;bnt&#64;erols<img src=/i/dc.gif border=0 width=35 height=15>&gt;
 Subject: [gti-vr6] Exhaust

 With so many of you saying that the exhaust makes a little difference or a
 slight difference.  I wonder if you bought it for increased horsepower or
 for the *FAST CAR* sound that it makes.

 I keep hearing over and over and over that it is only good above 4000 rpms
 so is it a stupid mod for power?  Perhaps the Kent Cam organizer is correct
 in saying that for the same price as the exhaust ( about 500) that the 12
 horses from the cam is a better buy than an exhaust which
 gives  a slight increase over stock (4-6 horses).  Just thinking out loud on
 a warm winter day.

 Ben t>>

 Ben,

 No, it's not a stupid mod for power.  You should be careful when you think
 out loud.  At least you seem to think a little more under this email address
 than you did as BMWETR...

 Let's recall something from our stock exhaust system.  Although it is a very
 good exhaust setup, there was a noticeable loss of power to me from 4K rpms
 through to redline.  Max torque/hp is at 5800 rpms according to the VW
 specifications.  So why not eliminate the loss of power when trying to get
 to your maximum hp?  That's what the aftermarket exhaust does.  The bonus is
 the exhaust note is oh so much sweeter.

 As far as cost parity, how much did it cost me to install the exhaust?
 Zero, zilch, nada.  Did it with a friend on a Saturday morning.  How much
 would it cost to go with cams, the same price if you do not include
 installation.  But you have to install them for the cams to be effective I
 would guess.  Supposedly if you go with Schrick Cams it makes sense to get
 the manifold as well, which launches the cost of the cam mod through the
 roof.

 Any input, Todd?

 Regards,
 Manny Rodrigues >>


In my opinion, the aftermarket exhaust issue on a VR6 is *mostly* a aesthetic
one.  This is in comparison to the older VW exhausts, which tended to be more
restrictive. However, that's not to say a well designed aftermarket VR6
exhaust does not do anything for performance, I just mean that the gains seen
on VR6s are not as great as on older VWs.
The older 8V/16V exhausts needed a good uncorking which tended to help all
parts of the powerband. The tubing was relatively small and the mufflers
crudely shaped for flow.  Lots of potential for power improvement everywhere.
The VR6 stock exhaust flows very well out of the box, yet an open straight
thru style will always ultimately outflow any baffled type exhaust, producing
better hp numbers.  The trick is to provide enough backpressure and muffling
to retain torque while augmenting hp.  The better designed aftermarket VR6
exhausts do this, while also being civilized in volume.  The Techtonics design
creates some backpressure by using a louvered type resonators coupled with
2.5" tubing.  The ND system retains the 2.25" stock diameter but creates
improved flow by using two straight thru Borla mufflers.  The Bosal/Brospeed
system seems to be the most restrictive of the bunch, and seems to create an
actual torque boost with no improvement in upper end.  They utilized a can
type mid muffler which creates significant backpressure.  It's also not much
different in tone or volume from stock, which is not what most people are
looking for in a sport exhuast.  The Neuspeed, in contrast, is quite loud in
volume yet "sporty" in tone with power gains on the line of a ND or TT system.
Whichever system chosen, the weight reduction of ~30lbs by dropping the mid
muffler is always a benefit with no exceptions.

The 268s need not be used with the VGi manifold to enjoy them.  They make a
great power band regardless of intake mods, yet when coupled with the VGi the
power band is even broader.  The 268s just keep going where the VGi torque
boost drops off.  BTW, nothing compares to the 268s and G-chip for daily
driving.  No compromises and the most power from any cams we've tried.  The
secret is in the chip.

Todd
Air & Water
VW Tuning
www.awe-tuning.com
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From gti-vr6-owner@dev.tivoli Wed Dec 2 13:21 CST 1998
From: "Richard Adams" <richard_adams@launch>
To: <AWE16VR6@aol>, <Manny.Rodrigues@usa.xerox>,
Subject: Re: Subject: [gti-vr6] Exhaust
Date: Wed, 2 Dec 1998 13:06:51 -0600
 
speaking of exhaust, here's some interesting reading from NASCAR
http://www.nascar.com/garage/00967892.html


Rich

p.s.
My SuperSprint kicks ass. YMMV.
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