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Exhaust Rattle or Sound Waves - Downpipes & Stage 2 Tune

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Exhaust Rattle or Sound Waves - Downpipes & Stage 2 Tune

 
Old 04-12-2019, 06:54 PM
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Exhaust Rattle or Sound Waves - Downpipes & Stage 2 Tune

Iím in the Dallas area and was hoping someone could recommend a shop to have my exhaust checked out? I have the UPD catless downpipes and Eurocharged Stage 2 Tune and everything is great except a rattle/sound wave sound that is completely different under full throttle. I donít hear it when revving in Park or gradually driving and getting to the high range RPMs. I just hear this exhaust flap rattle or maybe itís just the sound waves of engine/air flow through the OEM performance exhaust? It literally sounds like the valves are flapping really fast from all the increased airflow due to catless downpipes.

I was hoping someone has had both of these mods and heard this or at least a place they recommend in the Dallas, TX area to have it checked out? I went to Cedar Performance and they heard it too but said that the AMG engines all sound like this with these mods? They thought everything was healthy with the E63s. Iíve also confirmed no heat shields are touching and that there are no leaks.

OR maybe there is someone with a similar set up around the area that is willing to meet up and let me hear theirs?

I appreciate any help in advance!

Last edited by WhiteKnight16; 04-12-2019 at 07:19 PM.
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Old 04-13-2019, 08:54 AM
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I know on the F10 M5 platform many guys had significant wastegate rattle with catless downpipes. I just gutted my OEM downpipes on both my F10 M5s so I didnít have any rattle since OEM was double walled. My guess is that your catless downpipes are the culprit and it is wastegate rattle. Iím hoping I donít have that when I install mine next weekend. That will drive me nuts.

Are your downpipes coated?
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Old 04-13-2019, 09:24 AM
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The downpipes arenít coated but do you think if it was a wastegate problem then I would hear it while reviving the car in park? It only happens while moving and under heavy/full throttle.
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Old 04-13-2019, 11:50 AM
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Originally Posted by WhiteKnight16 View Post
The downpipes arenít coated but do you think if it was a wastegate problem then I would hear it while reviving the car in park? It only happens while moving and under heavy/full throttle.
The wastegate limits maximum boost. You wouldn't expect it to open unless the engine is under load.
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Old 04-13-2019, 11:56 AM
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Does it sounds like some rocks rolling around? If so, that is normal for your mods. Mine did/does the same.
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Old 04-13-2019, 12:24 PM
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Originally Posted by Ralcbah View Post
Does it sounds like some rocks rolling around? If so, that is normal for your mods. Mine did/does the same.
From catless downpipes? I donít think I will like the sound of rocks rolling around
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Old 04-13-2019, 12:37 PM
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Originally Posted by apsuard View Post
From catless downpipes? I donít think I will like the sound of rocks rolling around
Ah my bad man.
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Old 04-13-2019, 01:19 PM
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Originally Posted by Ralcbah View Post
Does it sounds like some rocks rolling around? If so, that is normal for your mods. Mine did/does the same.
I know what you are talking about. A few days ago I went to dyno after catless downpipes and stage 2 tune has been installed. After dyno I rolled my windows down (which I never did before on any car) and open pano roof because as we all know after catless downpipes there is a lot of smell and was driving between 2 walls and I noticed something sounds like you said "rocks rolling around" I thought something got broken, but no errors or anything else and car is solid. I was wondering did I get mechanical problems or what...

But this never happens again since that day.

Originally Posted by WhiteKnight16
I’m in the Dallas area and was hoping someone could recommend a shop to have my exhaust checked out? I have the UPD catless downpipes and Eurocharged Stage 2 Tune and everything is great except a rattle/sound wave sound that is completely different under full throttle. I don’t hear it when revving in Park or gradually driving and getting to the high range RPMs. I just hear this exhaust flap rattle or maybe it’s just the sound waves of engine/air flow through the OEM performance exhaust? It literally sounds like the valves are flapping really fast from all the increased airflow due to catless downpipes.

I was hoping someone has had both of these mods and heard this or at least a place they recommend in the Dallas, TX area to have it checked out? I went to Cedar Performance and they heard it too but said that the AMG engines all sound like this with these mods? They thought everything was healthy with the E63s. I’ve also confirmed no heat shields are touching and that there are no leaks.

OR maybe there is someone with a similar set up around the area that is willing to meet up and let me hear theirs?

I appreciate any help in advance!
To be honest, I don't understand what sound you are talking about, probably you can take a video?

My car has AMG performance exhaust and catless downpipes now, only one thing I can see weird that sound at the 1st start is making a weird sound under the car like exhaust has a leak or so, but there is no leak at all.

I think this is happening because exhaust has valves and increased airflow is trying to go through them or so because if I'm going to open valves this sound is going away.

Also, catless downpipes will add a lot of metal jingle sounds at high RPMs to the exhaust's sound because there are no catalytic anymore which are removing airflow twists and making exhaust sound more "friendly".
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Old 04-13-2019, 08:53 PM
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Originally Posted by apsuard View Post
I know on the F10 M5 platform many guys had significant wastegate rattle with catless downpipes. I just gutted my OEM downpipes on both my F10 M5s so I didnít have any rattle since OEM was double walled. My guess is that your catless downpipes are the culprit and it is wastegate rattle. Iím hoping I donít have that when I install mine next weekend. That will drive me nuts.

Are your downpipes coated?
you have 2 F10 M5s?
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Old 04-13-2019, 10:52 PM
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Originally Posted by MuffinFlavored View Post
you have 2 F10 M5s?
Sorry, I should have been more clear. I had a 2013 M5 then a 2015 M5. Very short time overlap
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Old 04-15-2019, 12:11 PM
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So I ended up going to a performance exhaust shop here in Dallas and was told that the larger pipe diameters (Downpipes and midpipes) to the OEM performance exhaust (smaller pipes) causes a lot of back pressure? They said this was common on all AMG V8 twin turbos. Basically the pipes after the resonator is what they were talking about.

I know the sound of the car when it starts up and how raspy it is but this is under full load and the sound is completely different than all other types of driving I do in that car.

What do you guy's think? It's not like a rock clunking around but rather the exhaust valve flaps rattling super fast or like a rattlesnake sound when I put it under full load. I can try to get some videos right now and post for you all.
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Old 04-15-2019, 01:14 PM
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Here are some videos. It's true that this is not portrayed well in the videos rather than in person but you can hear flapping/rattlesnake sound when you ignore all of the other normal sounds our AMGs make. I was hoping there was someone in Dallas or Houston with the same mods that would let us compare in order to determine if something with mine was off/not right.

Also, does the back pressure story i got from the custom exhaust shop sound plausible?
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Old 04-15-2019, 01:27 PM
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I couldnít even concentrate on the issue because it sounded so menacing. Canít wait to get my catless downpipes installed next weekend!

Awesome car bro
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Old 04-16-2019, 12:11 PM
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I've now talked to a few more shops and forum members and here is the answer I am getting:

"The added power and flow being put to the stock valve and cat back is creating too much pressure with the restrictive exhaust on there and that may be what is causing the fluttering of the valve. Without proper flow, the exhaust pressures may be beating the valve up a bit. The real solution is to open up the rest of the exhaust to relieve the pressure. You will probably see more power as well."

That being said, do you guys have any experience or suggestions on what I could do to fix this? I could talk to a custom exhaust shop and see how we can cut and weld some larger diameter pipes around the resonator and end of the exhaust but not sure how this would mess with the technology and electronics around this area?
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Old 04-16-2019, 12:57 PM
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I can't hear anything wrong or weird. Absolutely normal sound with the catless exhaust.

btw there are no resonators on AMG performance exhaust and if you are installing catless downpipes there are only mufflers left.

Stock diameter is 2.75" - downpipes are 3". I don't think it will cause any problems.

Only one thing I will concern about spool sound and airdrop sound. I assume you have aftermarket valves which make that loud sound.

P.S. I have a few videos of the sound of my car on my IG page ( AMG PE + catless downpipes) and you will see the same sound.
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Old 04-16-2019, 01:31 PM
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Originally Posted by WhiteKnight16 View Post
I've now talked to a few more shops and forum members and here is the answer I am getting:

"The added power and flow being put to the stock valve and cat back is creating too much pressure with the restrictive exhaust on there and that may be what is causing the fluttering of the valve. Without proper flow, the exhaust pressures may be beating the valve up a bit. The real solution is to open up the rest of the exhaust to relieve the pressure. You will probably see more power as well."

That being said, do you guys have any experience or suggestions on what I could do to fix this? I could talk to a custom exhaust shop and see how we can cut and weld some larger diameter pipes around the resonator and end of the exhaust but not sure how this would mess with the technology and electronics around this area?
Just watched the videos you posted and that's exactly how my C63s with catless downpipes sounded. It's just how these cars sound, much more "raspy" when catless.
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