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Discussion Starter · #1 ·
Apart from the aesthetic values, what are the avantages and disadvantages of each system on a 955i S3? ???
 

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I think the aesthetics ARE the only difference. I'm no expert but I have had my Trident exhaust (see the 02-02 955I forum) in both configurations. The low mount seemed a bit louder and I'm not sure why, but in the end I stuck with the high mount because it looked better IMO. Bike ran the same in both configurations.

Someone please correct me if I'm wrong. :popcorn:
 

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The low mount system was louder b/c it was less restrictive i.e. the gases traveled through less piping to get outside. Low mounts generally weigh less not to mention what they do for mass centralization. I'd say that from a performance standpoint, low mounts are superior to high mount systems.
-Derek
 

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I think the growl was the same in both configurations on my bike. Just louder when low.

Here is a quick flick of my bike's exhaust. I know its kinda queer but a buddy wanted me to send him a sound vid a couple of days ago and I was in a hurry to do it (notice my youngest who is thoroughly infatuated with Speedy at the age of 1. We've nicknamed her "Techy" because she has an uncanny knack for getting anything electronic to work.)

 

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For that year speed 3 the undertail exhaust is the only way to go. It makes what now seems like a bulbous fat ass look slimmer. it is funny those old model speed triples were my fantasy at one time. I saw one at the dealership the other day and it almost looks like a sport tourer compared to the new style. time and people change i guess.
 

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Discussion Starter · #7 ·
Not sure about the undertail thing. It's still in favour with many of the manufacturers, but many of the new models are going back to the low-mount. As you said, kmoss, times change and fashions come and go.
 

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tomstumble said:
My question is how do the sounds compare? Does the high mount have a throatier growl to it? That is what I am in search of.
Generally speaking, the low mount systems use a shorter midipe. This can make them louder due to the sound pulses not dissipating as much as with a longer midpipe. Slight bends in the pipes can also alter the shape of the exhaust pulses - making them sound a bit different as they enter the silencers.
 

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Devious2xs said:
Generally speaking, the low mount systems use a shorter midipe. This can make them louder due to the sound pulses not dissipating as much as with a longer midpipe. Slight bends in the pipes can also alter the shape of the exhaust pulses - making them sound a bit different as they enter the silencers.
Devious. Would you say that a chunk of low-end power would be lost if you install a low mount/short midpipe system?
 

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In many cases, yes.

The Zard silencer seems to be the most common low mount design on S3s today. There are only a few dyno graphs out there for them, but each one I have seen loses a bit of low end torque.

When Avi8or tuned his Zard full system, he was forced to reduce fuel at lower rpm in order to get best power and engine response.

On engines with higher cam timing and higher head flow, a shorter collector length is less noticeable - less torque to lose, and more high end gains are possible - if the flow allows it.
 

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Andhedrew said:
I think the growl was the same in both configurations on my bike. Just louder when low.

Here is a quick flick of my bike's exhaust. I know its kinda queer but a buddy wanted me to send him a sound vid a couple of days ago and I was in a hurry to do it (notice my youngest who is thoroughly infatuated with Speedy at the age of 1. We've nicknamed her "Techy" because she has an uncanny knack for getting anything electronic to work.)
DUDE, I think I heard yer exhaust make the sound of a young child!?!?! If that's not crazy enough it seems like you start the bike as a man but return in the video as a little girl in a pink coat. Those Trident's must do some weird sh!t!!!
 

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Devious2xs said:
In many cases, yes.

The Zard silencer seems to be the most common...
That sucks! Do you think it's enough of a loss to put me off installing a Mivv carbon low mount? Would there be more of a loss (typically) with a "type approved" can or a GP can?
Thanks,
D
 

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Think of it this way, up to a point, the longer the mid-pipe, the less loss of low end.

The Mivv looks like a practical balance between stock and the Zard. But I have no idea what the Mivv produces for torque. I've never seen a dyno chart.

If the cams in the S3 were longer duration, then the shorties would be better - IMHO.
 

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Number one, never trust a manufacturer's dyno sheets.
I can show you tests of the same system that have bigger differences than Mivv shows.

But the peak numbers are what I would expect with ANY system without tuning. It takes fuel to make power if you have already added flow.



Do you want to compare STOCK silencers (with catalysts), to aftermarket silencers, or do you want to compare different aftermarket exhaust designs.

Like I said before, of the low mount designs, the Mivv looks like a relatively decent design, with a short midpipe. This is one of the shorties that interest me. I would love to see one tuned well and learn how it performs.
 

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I think I'm going to buy it. And get a new air filter as well. Do you think I should buy the Tuneboy or will this TORS tune I keep hearing about suffice?
Thanks,
D
 

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The TORS tune will work, but real tuning via TuneBoy or PCIII will release more power - especially in the midrange. You can always do tuning later.

Do it! Get the Mivv. I dare ya! :)
 
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