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-   -   F32 - 430d M Sport - Back Box Delete & Dual Exhaust (PIC) Engine Drone Question (https://www.bimmerfest.com/forums/showthread.php?t=1258356)

firaxo 03-30-2018 01:56 PM

F32 - 430d M Sport - Back Box Delete & Dual Exhaust (PIC) Engine Drone Question
 
1 Attachment(s)
Hi,

I have a F32 430d M Sport (2015).
Had a back box delete done and dual exhaust fitted.

Since then I noticed sometimes (it seems at random) the car starts making a droning noise.
I can hear it very clearly around 2.5K RPM from the cabin. It's like a very low, basey wwwwww noise. At higher/lower RPM it's not or almost not audible.

It's possible that the sound was there before I done the exhaust mods, but I have never noticed it.... so I doubt it was there.

I actually like the droning sound, it adds character to the engine sound and also from the outside it sounds a lot louder.

Does anyone know why or how this sounds occurs?
And does anyone know how I could maybe cause this sound to occur when I want it to?

Any answers would be much appreciated.

https://imgur.com/Q28aloP

firaxo 03-30-2018 02:07 PM

1 Attachment(s)
Here's another pic of the exhaust so you can see the inner workings a bit.

Maybe this helps understand why the droning happens?

Any ideas appreciated.

Thanks.


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