2014 B8.5 S4 Rattling when slowing down to a stop

[1ronin]

As title says, recently noticed that when I have the window down and slowing down to a stop I hear rattling which gets louder towards complete stop.
The car does not shudder and drives fine, and don't have the technical know how to investigate under the car.

I did get the car installed with an X-pipe last year and no issues so far and does not rattle when at full throttle.
Anywhere specifically where I should be checking for loose bolts or metal shield?

Should I bring this to a shop to look into and fix?

Thanks in advance.

[SGR]

Sounds like it might be rattling from a resonator or a heat shield. While parked, try holding the throttle at various rpms, e.g., 1k, 1.5k, 2k, etc., and see if you can reproduce it. If you can, it’s probably rattle somewhere along the exhaust.

If yes, then it can be done while on a lift and the exact source should be able to be located.


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[maty360414]

flex pipes most likely

[1ronin]

flex pipes most likely

Thanks, is this something I should bring to Audi for or a small shop to fix?
Is this a side effect of going X-pipe? I don't think I heard this rattle before.

I tested the throttle and its exactly rattling at 1k while dropping.
Going up in throttle doesn't make any rattle, but the side affect is a smile to my face :)

[SGR]

Thanks, is this something I should bring to Audi for or a small shop to fix?
Is this a side effect of going X-pipe? I don't think I heard this rattle before.

I tested the throttle and its exactly rattling at 1k while dropping.
Going up in throttle doesn't make any rattle, but the side affect is a smile to my face :)

Cool. It is most likely completely benign. However, you don’t have much to lose by bringing it to a shop to see if it is something that can be corrected by a quick adjustment. Alternatively, if it is pretty subtle, I would just occasionally monitor for any worsening of the rattle.


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[1ronin]

Cool. It is most likely completely benign. However, you don’t have much to lose by bringing it to a shop to see if it is something that can be corrected by a quick adjustment. Alternatively, if it is pretty subtle, I would just occasionally monitor for any worsening of the rattle.


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Sounds good, I'll keep monitoring it for a bit while also looking for a shop nearby.
I don't drive much as I mostly work from home, but today I went into the office and was in stop and go traffic.
Every time the revs dropped around 1k, the rattle would show up.

[SGR]

Sounds good, I'll keep monitoring it for a bit while also looking for a shop nearby.
I don't drive much as I mostly work from home, but today I went into the office and was in stop and go traffic.
Every time the revs dropped around 1k, the rattle would show up.

Sounds good! Enjoy the exhaust!


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[AFR1485]

It’s the downpipes. The OEM part is know to rattle. You can go to Audi and pickup and oem replacement or get a set pair of aftermarket pipes.


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[1ronin]

It’s the downpipes. The OEM part is know to rattle. You can go to Audi and pickup and oem replacement or get a set pair of aftermarket pipes.


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Thanks, yes the sound is coming more towards the front rather than the back.
Is this something I should be concerned about? (Leaks, potential expensive repairs down the road)
How much do DP's go for, and will going aftermarket revoke my warranty? (I'm CPO with warranty til 2022).