Facelift Exhaust rattle after fitting downpipe

billymc92

2018 Ara Blue Facelift RS3
Wonder if anyone could help me. Since fitting my Milltek downpipe it seems I get a rattle when I accelerate. And stops when I let off the accelerator. At first I thought it was something loose. Heatsheild or bolt ect but had it on ramp and can’t see anything. And it actually sounds like it’s coming from inside the exhaust. (Best way to describe it is lots of wee stones belting through it)

Here’s the interesting part. I don’t have the cold start rattle anymore. It actually sounds the exact same noise but like I say, it’s not on cold start, it’s when I accelerate.

I’ve got a few videos here,


Any help would be greatly Appreciated. It still does it in sport unlike the cold start rattle noise would stop.
 

Dodgygtr

Registered User
Wonder if anyone could help me. Since fitting my Milltek downpipe it seems I get a rattle when I accelerate. And stops when I let off the accelerator. At first I thought it was something loose. Heatsheild or bolt ect but had it on ramp and can’t see anything. And it actually sounds like it’s coming from inside the exhaust. (Best way to describe it is lots of wee stones belting through it)

Here’s the interesting part. I don’t have the cold start rattle anymore. It actually sounds the exact same noise but like I say, it’s not on cold start, it’s when I accelerate.

I’ve got a few videos here,


Any help would be greatly Appreciated. It still does it in sport unlike the cold start rattle noise would stop.
Is it not time to replace with full miltek exhaust?
 

billymc92

2018 Ara Blue Facelift RS3
Is it not time to replace with full miltek exhaust?

well that was my plan before. but now its so loud and I don't really want it any louder lol. plus they have still not released the back box yet. if I cant get a solution I guess that will be the only way to go
 

terminator x

Registered User
Wow sounds awful. What have Audi done to you FL owners :-/

TX.

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Dodgygtr

Registered User
ohh wait a minute, they have updated there website saying they will be ready for March
Could always give them a ring to see how much louder it is? Think I’m going full exhaust just not sure which make yet but I think they are the only ones so far, for the saloon anyway.
 

Leo-RS

Registered User
Cold start is to warm the cat up for emissions purposes. As you don’t have a cat in there anymore, MRC map it out. They actually map it out even if you do still have the cat in place.

No idea about the rattle though. Is it coming from the front or the rear of the car?
 

billymc92

2018 Ara Blue Facelift RS3
Someone said it could be the rear silencers breaking up/disintegrating due to the heat as there is now no cats. Little particles could be vibrating about inside the silencers now? Could this be a chance?
 

AudiNutta

Moderator
Staff member
Moderator
Gold Supporter
Oh that’s bad!!

Sounds exactly like the cold start rattle, only just permanent.
I doubt Audi will pay out with the decat :/
 

billymc92

2018 Ara Blue Facelift RS3
Oh that’s bad!!

Sounds exactly like the cold start rattle, only just permanent.
I doubt Audi will pay out with the decat :/
Exactly lol. People on the other form are saying it’s pinking and happens at around 2k revs. No idea what that is but it’s definitely not normal and needs sorted. Sounds hideous
 

Beebee-one

Registered User
If you check out some of the Youtube guys who have fitted down pipe's to their FL car ('Mod-It' being one for example), some of them have removed it after a week or so of running it. Can't remember exactly why but maybe due to a similar reason? Also, I remember reading something about the quality of Milltek dp's in one of Aoon's PFL car threads recently (the general fitment and possibly brackets fouling bodywork making a noise). May be worth a look?
 

Spinstorm

Registered User
The problem @billymc92 is you have screwed your warranty now.

I get that you want to make your car better but it’s already very fast and loud and so personally I don’t get the appeal of risking these changes; as now you have to burden the cost of fixing this issue and you don’t know what the problem is and I don’t need to tell you that could be very expensive.
 

billymc92

2018 Ara Blue Facelift RS3
The problem @billymc92 is you have screwed your warranty now.

I get that you want to make your car better but it’s already very fast and loud and so personally I don’t get the appeal of risking these changes; as now you have to burden the cost of fixing this issue and you don’t know what the problem is and I don’t need to tell you that could be very expensive.

But now I have a fun car
 
well that was my plan before. but now its so loud and I don't really want it any louder lol. plus they have still not released the back box yet. if I cant get a solution I guess that will be the only way to go

Yes they have released it, i got prices and maybe order for my friends car with stock exhaust :D
 

Jsimba

Registered User
Did you get to the bottom of this rattle at all?

I've got a totally stock exhaust system but have noticed a light rattle on acceleration too. At first I thought it might be from the engine area but now I wonder if it's a similar issue to this.

It's a faint rattle but enough that I can hear it on acceleration (even if no one else seems to be able to!)
 

T-1000

Well-Known Member
Gold Supporter
Did you get to the bottom of this rattle at all?

I've got a totally stock exhaust system but have noticed a light rattle on acceleration too. At first I thought it might be from the engine area but now I wonder if it's a similar issue to this.

It's a faint rattle but enough that I can hear it on acceleration (even if no one else seems to be able to!)

Wastegate rattle ?


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T-1000

Well-Known Member
Gold Supporter
Evening! Yep, I think it could well be the dreaded wastegate rattle appearing...

I altered mine being at stage 2 to be closed at lower RPM (2k) which is where it was noticeable.
If your standard then I’m afraid it’s something you’ll have to put up with.


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Jsimba

Registered User
I altered mine being at stage 2 to be closed at lower RPM (2k) which is where it was noticeable.
If your standard then I’m afraid it’s something you’ll have to put up with.


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Ah shucks, I had a feeling you might say that..! Ill have to take a look back through the old threads on this to see of there's at least a way of minimising the noise
 

T-1000

Well-Known Member
Gold Supporter
Ah shucks, I had a feeling you might say that..! Ill have to take a look back through the old threads on this to see of there's at least a way of minimising the noise

You can have it patched out but it will still involve a remap even at stock level.


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