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Downpipe suggestions

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AMG GT The GT/GT S is the second sports car developed entirely in-house by Mercedes-AMG. Its front mid-engine design with a rear transaxle, the use of aluminium lightweight construction and its newly developed AMG 4.0-liter V8 biturbo engine underscores the hallmark of AMG driving performance.
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Downpipe suggestions

 
Old 05-20-2019, 09:32 PM
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Downpipe suggestions

Newly purchased and loving my gts so the modding will just be a loooooong process so I can enjoy the newness. Would like suggestions on downpipes. Not super expensive and not loud. I like the note stock maybe slightly louder which can be achieved by removing resonator. Thanks in advance.
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Old 05-20-2019, 10:42 PM
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I would strongly suggest checking out Keller Performance. I just recently installed a set of their downpipes and loved them. The quality and craftsmanship is definitely a plus. All of their downpipes are 3D scanned for exact fitment so you won't need to do any modifications to install them. A big plus for me because I am a very picky person. The price is just right as well compared to other companies who are charging an arm and a leg.
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Old 05-21-2019, 08:11 AM
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Originally Posted by vivo_amg View Post
Newly purchased and loving my gts so the modding will just be a loooooong process so I can enjoy the newness. Would like suggestions on downpipes. Not super expensive and not loud. I like the note stock maybe slightly louder which can be achieved by removing resonator. Thanks in advance.
Cut the secondary cats. No CEL and it might be exactly what you are looking for. A lot of members have done this to their GT.
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Old 05-21-2019, 08:26 AM
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Originally Posted by MG1422 View Post
Cut the secondary cats. No CEL and it might be exactly what you are looking for. A lot of members have done this to their GT.
I second this. See if that gets you what you want, before the hassle of messing with the DPs.
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Old 05-21-2019, 08:39 AM
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Originally Posted by MG1422 View Post
Cut the secondary cats. No CEL and it might be exactly what you are looking for. A lot of members have done this to their GT.
Hate to sound dumb af but what is CEL? Haha
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Old 05-21-2019, 08:41 AM
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Originally Posted by vivo_amg View Post
Hate to sound dumb af but what is CEL? Haha
No Worries! Check Engine Light. Downpipes will require a tune if you want to get rid of the CEL. But I think Renntech's new downpipes do not trigger a CEL.
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Old 05-21-2019, 08:45 AM
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Reference for what it sounds like after removing secondary cats, with valves open:

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Old 05-21-2019, 08:49 AM
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Originally Posted by Orcbolg View Post
Reference for what it sounds like after removing secondary cats, with valves open:

https://www.youtube.com/watch?v=ARPoCh3-Ihc&t=24s
I think that the car in the video has aftermarket downpipes. Not 100% sure but that car is LOOUUDD
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Old 05-21-2019, 08:55 AM
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Originally Posted by MG1422 View Post
I think that the car in the video has aftermarket downpipes. Not 100% sure but that car is LOOUUDD

Sounds identical to mine, after cat surgery, in Race Mode.
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Old 05-21-2019, 09:12 AM
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Here's what mine sounds like, switching from Comfort to Race, after removal of the secondary cats:

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Old 05-21-2019, 09:26 AM
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Originally Posted by Orcbolg View Post
Here's what mine sounds like, switching from Comfort to Race, after removal of the secondary cats:

https://www.youtube.com/watch?v=pkoDuR1793w
I guess you could be right. I've never heard from the outside of the car just the inside, lol
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Old 05-21-2019, 09:38 AM
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Originally Posted by MG1422 View Post
I guess you could be right. I've never heard from the outside of the car just the inside, lol
Very understandable. There's a fairly drastic difference between the in-cabin sound, and what you hear from behind the vehicle.
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Old 05-21-2019, 12:38 PM
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Thank you!

Would it be possible to hear some revs in sport mode?
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Old 05-21-2019, 12:45 PM
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Originally Posted by DriveAMG View Post
Would it be possible to hear some revs in sport mode?
Normal Sport, not Sport+?



Edit: Here is Sport first, followed by Sport+:


Last edited by Orcbolg; 05-21-2019 at 01:02 PM.
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Old 05-21-2019, 04:05 PM
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Thatís perfect!

Thank you!
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Old 05-21-2019, 05:18 PM
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IMO you lose low end octave with DPs. No offense but it sounds like a tractor to me, And if you get into revs, you hear ithat spoon in the garbage disposal sound but that’s just me what a do I know
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Old 05-21-2019, 11:24 PM
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Originally Posted by MG1422 View Post
Cut the secondary cats. No CEL and it might be exactly what you are looking for. A lot of members have done this to their GT.
Which are the "secondary" cats?
The front pair (closer to the turbos)?
...Or the rear pair (closer to the exhaust)?
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Old 05-21-2019, 11:47 PM
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Originally Posted by P Rock View Post
Which are the "secondary" cats?
The front pair (closer to the turbos)?
...Or the rear pair (closer to the exhaust)?
The ones just past the down pipes, not the primaries that are built into the DPs.
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Old 05-22-2019, 07:51 AM
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Originally Posted by Orcbolg View Post
The ones just past the down pipes, not the primaries that are built into the DPs.
What he said ^^^

The ones you can easily touch if you are under the car.
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Old 05-22-2019, 10:11 AM
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Originally Posted by Orcbolg View Post
The ones just past the down pipes, not the primaries that are built into the DPs.
These two?
Attached Thumbnails Downpipe suggestions-20190522_101023.jpg  
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Old 05-22-2019, 10:17 AM
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Originally Posted by P Rock View Post
These two?
Correct! the secondary cats are the ones with the yellow arrows.
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Old 05-22-2019, 10:42 AM
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Originally Posted by MG1422 View Post
Correct! the secondary cats are the ones with the yellow arrows.
Nice! Thanks.. I'm going to have this done
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Old 05-22-2019, 10:47 AM
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Originally Posted by P Rock View Post
Nice! Thanks.. I'm going to have this done
I did it to my GTR and it was the best $120 I've spent on the car. Good thing is, if you don't like the sound, just weld them back on.
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Old 05-22-2019, 11:07 AM
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Originally Posted by MG1422 View Post
I did it to my GTR and it was the best $120 I've spent on the car. Good thing is, if you don't like the sound, just weld them back on.
Lastly, what diameter is the pipe needed?
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Old 05-22-2019, 11:09 AM
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Originally Posted by P Rock View Post
Lastly, what diameter is the pipe needed?
I wouldn't be able to tell you exactly but I would think any exhaust shop you go to has the correct size. It might be 2.5 inch or 3 inch
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