Thread: DPF Delete
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      11-05-2013, 06:53 PM   #48
TDIwyse
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Drives: 2011 335d
Join Date: Aug 2012
Location: MidWest

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Was still curious to know if you notice any droning at certain rpm's?

http://dictionary.reference.com/browse/droning

That large open cavity inside the DPF shell... I'd expect some type of resonance to occur somewhere in the rpm band. A similar sized cavity in the exhaust of my Cummins inline 6 cylinder diesel caused a really unpleasant drone at ~1900-2100 rpm's. Ended up replacing the high flow muffler for something else to make it go away.