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Oxford white 10r80 gt

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Watched a few and I don’t see the comparison what I hear honestly when I Drive it doesn’t even bring something mechanical to mind it seriously just sounds like something buzzing or vibrating against something else and it’s literally right behind my dashboard I made a shorter video just so you can hear how isolated the noise is https://www.dropbox.com/s/7lb3obcrj97ben5/IMG_1678.TRIM.MOV?dl=0
 

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Could be something loose. Hopefully something minor.
 

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The second clip sounds way different than the first clip, I was sure it wasn’t piston slap after the first one, but after listening to the 2nd clip it sounds more like piston slap that the first.
The 1st I would have said plastic in the dash, but the 2nd clip sounds more metallic, I would certainly look at the exhaust stuff for something loose or touching something it didn’t before since this started after those changes.
 

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Yup dealer blames my corsa xtreme catback but I still want to fix it any ideas I could try?
Get under it and move things around or see if there is something that is rubbing, or touching somewhere it could create a vibration
 
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Get under it and move things around or see if there is something that is rubbing, or touching somewhere it could create a vibration
So you think it’s something that’s actually under my car? Not behind the gauge cluster itself?
 

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So you think it’s something that’s actually under my car? Not behind the gauge cluster itself?
Just going by the information provided, if you didn’t have that noise until making changes to the exhaust and now you do, that would be where I would start.
I assume it makes the same sound while parked revving in place, have someone rev it while your outside and see if you can hear it.

Trying to diagnose it from a sound clip is near impossible, as I have already stated they both sounded completely different......to me
 

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Just going by the information provided, if you didn’t have that noise until making changes to the exhaust and now you do, that would be where I would start.
I assume it makes the same sound while parked revving in place, have someone rev it while your outside and see if you can hear it.

Trying to diagnose it from a sound clip is near impossible, as I have already stated they both sounded completely different......to me
I actually tried the same thing parked in neutral and in park through the same rev range and it’s completely silent but I think the load is different when the motor is actually in drive and being driven
 
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Just going by the information provided, if you didn’t have that noise until making changes to the exhaust and now you do, that would be where I would start.
I assume it makes the same sound while parked revving in place, have someone rev it while your outside and see if you can hear it.

Trying to diagnose it from a sound clip is near impossible, as I have already stated they both sounded completely different......to me
I had my phone much closer in the second clip which may give reason to better quality and it sounding different than the first but from what I have heard it just sounds like plastic rattling or something in the dash nothing more and it makes a similar noise in the rear seat area my service advisor and one of his mechanics took a drive in the car today
 
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They blame the backpressure from the exhaust and it just resonating throughout the underside of my car and with 2k-3k being the range for rasp from an exhaust like corsa xtreme I could see that for sure but no the noise wasn’t present with stock exhaust but I had mbrp race catback before this one and I don’t think it helped as it was very droney
 

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That's the "2k rattle"
 
 








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