[E92M3GT]

I have a 2013 DCT E92 M3, competition package

First I put only Supersprint race exhausts, as they were not so loud as other brands with their race exhausts. All perfect !

Then I added an X pipe, that deletes the first cats, but leaves secondary cats and resonators. I felt big performance improvement, but now I have some drone inside the cabin...

I know this is caused by the X pipe, although it has secondary cats and resonators. Now I am changing to a set of ESS rear exhausts, as I know they will sound quieter, and therefore hope to eliminate drone

But any hints how to minimize drone ? Wrap some parts of the exhaust system or so ?

Thanks in advance for the help !