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Old 08-03-2024, 06:39 PM
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997 tt/rs
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Default 993 RS exhaust difference

Hi Guys, wondering do you know what are the differences between the 993 RS exhaust and the Carrera 2S or Carrera 2?

Thanks
K
Old 08-04-2024, 12:11 AM
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boomboomthump
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Believe they are quieter.
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Holger3.2 (08-04-2024)
Old 08-04-2024, 05:44 AM
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Thanks but Im looking for precise information. I expect diameter is bigger at RS
Old 08-04-2024, 06:06 AM
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orangecurry
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Isn't everything the same, other than the 2x box internals?

Generally only turbo engines have the need for wider pipes/better breathing.
Old 08-04-2024, 09:51 AM
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According to the PET (no specific call-outs to anything unique on the RS) and the Carrera RS technical overview manual, there are no differences noted at all.


That said, not long ago (cant recall who) stated pretty emphatically that the RS muffler cans were "quieter" to meet some sort of European requirement for the 3.8L. Never personally fact checked that (hence the "believe they are quieter" comment) until I looked at the PET and Carrera RS manual just now. I don't see any evidence of there being differences. Headers, cat, mufflers all seem to be standard.
Old 08-04-2024, 10:52 AM
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Well we know the 'mufflers' are different, as they have different part numbers. But I doubt anyone has cut up an RS muffler to see the internal differences. External dimensions are the same, RS to standard.

Last edited by orangecurry; 08-04-2024 at 10:59 AM.
Old 08-04-2024, 12:12 PM
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The Mufflers are only different in regards to Bishoff or the Gillet manufactured versions, model year, and for the later in relation to the M159 'engine sound package' (which consists of a different airbox and tips).
No specific different system for the RS.


I take everything back and claim the opposite
sorry for that ...

Above is for the US PET Version

The German PET version shows clearly 2 other muffler versions (again Bishoff or the Gillet manufactured) specifically for the RS (M64.20);
which is slightly weird as it has to same part numbers as the US M159 package .... .
So conclusion might be that for the RS, the engine sound package is a standard... but seems also that there is still no difference in the muffler...

So it is therefore unlikely that the RS was quieter than other models

Last edited by Holger3.2; 08-04-2024 at 12:30 PM.
Old 08-04-2024, 01:36 PM
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My brain failed me on that one. The M64.20's mufflers are in the US PET too but for whatever reason since I didn't see "Carrera RS" as designated on other parts, it didn't register pre-coffee in the morning.

Interesting however that it's not mentioned in the Carrera RS technical overview manual at all.
Old 08-04-2024, 02:32 PM
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Originally Posted by 997 tt/rs
Hi Guys, wondering do you know what are the differences between the 993 RS exhaust and the Carrera 2S or Carrera 2?

Thanks
K
Besides the Gillette, Bischoff difference
there were 3 different mufflers used on n/a 993,
there was additional f/g deadening material which has been removed from all of these
base was this one w/ the small cross tube


motor sound and RS has a larger cross tube


there was also an RS version for Austria which was quieter, no pics of that one

and then there was the tt version




tt version flows best, the others are a toss up for flow
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orangecurry (08-04-2024)
Old 08-04-2024, 02:37 PM
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Originally Posted by boomboomthump
My brain failed me on that one.
It really did - you and I posted the same info a few months back - your data was the same as mine, but much easier to read!
  • All of them begin with 993.111 followed by:
    • .045 = left, .046 = right, followed by:
      • .04, .11 or .13 = standard muffler
      • .05, .10 or .14 = RS muffler
      • .07, .12 or .15 = Motor Sound muffler (sound pkg M159)
      • .53 or .54 = Turbo muffler

Last edited by orangecurry; 08-04-2024 at 03:38 PM.
Old 08-04-2024, 06:50 PM
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Originally Posted by boomboomthump
That said, not long ago (cant recall who) stated pretty emphatically that the RS muffler cans were "quieter" to meet some sort of European requirement for the 3.8L. Never personally fact checked that (hence the "believe they are quieter" comment) until I looked at the PET and Carrera RS manual just now. I don't see any evidence of there being differences. Headers, cat, mufflers all seem to be standard.
Originally Posted by orangecurry
Well we know the 'mufflers' are different, as they have different part numbers. But I doubt anyone has cut up an RS muffler to see the internal differences. External dimensions are the same, RS to standard.
It was the chap who has cut up hundreds if not thousands of 993 mufflers, Robin Sun:

Originally Posted by Robin 993DX
David,

The RS muffler that comes with the 993 3.8 motor kit, or ones from a factory 3.8 RS is different from a standard 993 muffler.

The difference is that the 993 RS muffler is missing the internal by-pass tube, which makes them even quiter than the standard 993 muffler.

The reason for this is because in order for the 3.8 RS and the 3.8 motor kit to pass Europe's drive by noise regulation it has to be quieter, since now the motor is bigger so the muffler must muffle more noise.

Below is an internal picture of a standard 993 muffler and a motor sound muffler, Porsche increase the diameter of the by-pass tube to make the motor sound muffler sound a little louder.

<img src="http://p-car.com/exhaust/mufflercomparet.jpg" alt=" - " />
Source: https://rennlist.com/forums/993-foru...tml#post119308
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orangecurry (08-04-2024)
Old 08-04-2024, 07:01 PM
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Originally Posted by orangecurry
It really did - you and I posted the same info a few months back - your data was the same as mine, but much easier to read!
  • All of them begin with 993.111 followed by:
    • .045 = left, .046 = right, followed by:
      • .04, .11 or .13 = standard muffler
      • .05, .10 or .14 = RS muffler
      • .07, .12 or .15 = Motor Sound muffler (sound pkg M159)
      • .53 or .54 = Turbo muffler

Not posting before my morning coffee again. Yep, I remember making the above post with the muffler part numbers.
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orangecurry (08-04-2024)
Old 08-04-2024, 07:15 PM
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Originally Posted by ch3tman
It was the chap who has cut up hundreds if not thousands of 993 mufflers, Robin Sun:

The difference is that the 993 RS muffler is missing the internal by-pass tube, which makes them even quiter than the standard 993 muffler.

The reason for this is because in order for the 3.8 RS and the 3.8 motor kit to pass Europe's drive by noise regulation it has to be quieter, since now the motor is bigger so the muffler must muffle more noise.
Well I'll go to the foot of our stairs.
Old Yesterday, 06:35 AM
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This was written by a friend who used to build exhaust systems for 993.
"From memory the Carrera exhaust has a small connection pipe between the inlet pipe and outlet pipe inside the muffler.The RS muffler has no connection pipe. Other than that the tube size is the same."
Old Yesterday, 07:08 AM
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Originally Posted by 997 tt/rs
Thanks but Im looking for precise information. I expect diameter is bigger at RS
So your friend has just confirmed the above is incorrect.


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