New RS Q8 - Anyone removed the rear large resonator?
08-17-2021, 12:10 PM
#11
AudiWorld Junior Member
Thread Starter
Nice - looks like they only welded back a hanger bracket for the left pipe and the right one is just hanging in the middle. Was that the intent?
Do you mind sharing approx. what they charged you? You say it is still not loud enough - was it worth it? Did your dealer provide any opinion about how / if this affects your warranty?
Do you mind sharing approx. what they charged you? You say it is still not loud enough - was it worth it? Did your dealer provide any opinion about how / if this affects your warranty?
This cannot void warranty. Its post Cats/GPF on the exhaust.
Look up magnuson moss warranty act.
08-17-2021, 01:39 PM
#13
AudiWorld Senior Member
This is a quiet engine unless WOT.
Once you remove the cats, or put in some high flow 200 cell cats, it gets a lot louder.
Go to this YouTube video, they cut open the rear muffler. There's nothing in there except chambers, fewer chambers with the valves open.
Here's a screen shot of the muffler opened up.
Adding 200 cell downpipes or catless downpipes are the only thing to make this car louder.
This video just posted, a cat change out. Very good.
Once you remove the cats, or put in some high flow 200 cell cats, it gets a lot louder.
Go to this YouTube video, they cut open the rear muffler. There's nothing in there except chambers, fewer chambers with the valves open.
Here's a screen shot of the muffler opened up.
Adding 200 cell downpipes or catless downpipes are the only thing to make this car louder.
This video just posted, a cat change out. Very good.
08-18-2021, 06:54 AM
#14
AudiWorld Junior Member
Thread Starter
This is a quiet engine unless WOT.
Once you remove the cats, or put in some high flow 200 cell cats, it gets a lot louder.
Go to this YouTube video, they cut open the rear muffler. There's nothing in there except chambers, fewer chambers with the valves open.
https://youtu.be/MTbXHPL1t60?t=204
Here's a screen shot of the muffler opened up.
Adding 200 cell downpipes or catless downpipes are the only thing to make this car louder.
This video just posted, a cat change out. Very good.
https://youtu.be/x9TiexwL6zw
Once you remove the cats, or put in some high flow 200 cell cats, it gets a lot louder.
Go to this YouTube video, they cut open the rear muffler. There's nothing in there except chambers, fewer chambers with the valves open.
https://youtu.be/MTbXHPL1t60?t=204
Here's a screen shot of the muffler opened up.
Adding 200 cell downpipes or catless downpipes are the only thing to make this car louder.
This video just posted, a cat change out. Very good.
https://youtu.be/x9TiexwL6zw
Thanks for the video and screen shot of the muffler. Looks like if the flaps are open all the time, will improve the sound as i am looking for!
I am not removing the cats for multiple reasons.
08-19-2021, 06:16 AM
#15
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08-19-2021, 09:08 AM
#16
AudiWorld Senior Member
Yes, straight pipes back from cats/downpipes.
The end muffler is puzzling to me. It appears they use chamber resonance to suppress the sound.
I always thought with the valves wide open, that the muffler was bypassed and this was more or less straight pipes. you can see from the photo below, that isn't the case.
The end muffler is puzzling to me. It appears they use chamber resonance to suppress the sound.
I always thought with the valves wide open, that the muffler was bypassed and this was more or less straight pipes. you can see from the photo below, that isn't the case.
08-19-2021, 09:41 AM
#17
AudiWorld Senior Member
I wish this made more sense. The more I look at it, the more questions I have.
It looks like one side of the muffler is different than the other.
Does anyone know for sure? Simply keep the valves open and we are still subject to this chambering. Weird.
It looks like one side of the muffler is different than the other.
Does anyone know for sure? Simply keep the valves open and we are still subject to this chambering. Weird.
08-19-2021, 09:10 PM
#18
AudiWorld Senior Member
This guy says he has straight pipes. The way it crackles, it sounds like catless downpipes with a tune as well.
another video same car. Has to be tuned.
another video same car. Has to be tuned.
Last edited by 1stRS; 08-19-2021 at 09:15 PM.
08-20-2021, 06:20 AM
#19
AudiWorld Junior Member
Thread Starter
Definitely sounds like the downpipes were changed out to remove the factory cats. Also a tune is required when doing this.
Sadly, living in CA....not an option here.
10-20-2023, 12:52 PM
#20
I’ve done it, search for the Urus exhaust thread.
it’s great without that resonator. Do it, you will not be sorry. Make sure you have the shop weld in a hanger (attached to both pipes) to replace the hanger that is attached to the resonator.
https://youtu.be/0RFCJC2AhFE
it’s great without that resonator. Do it, you will not be sorry. Make sure you have the shop weld in a hanger (attached to both pipes) to replace the hanger that is attached to the resonator.
https://youtu.be/0RFCJC2AhFE
@1stRS did you only do the large resonator or have you taken out the two smaller ones up front as well? If so did it make an even bigger impact? Did it cause any drone on the highway at 90-100mph? Thank you!!