F32 - 430d M Sport - Back Box Delete & Dual Exhaust (PIC) Engine Drone Question - Bimmerfest - BMW Forums



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Old 03-30-2018, 12:56 PM
firaxo firaxo is offline
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Mein Auto: 430d Coupe M Sport
F32 - 430d M Sport - Back Box Delete & Dual Exhaust (PIC) Engine Drone Question

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.

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  #2  
Old 03-30-2018, 01:07 PM
firaxo firaxo is offline
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Location: London, United Kingdom
 
Join Date: Dec 2016
Posts: 7
Mein Auto: 430d Coupe M Sport
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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