I did a muffler delete on my 2011 E92 M3,, the drive home I decided to take it off and just buy a aftermarket exhaust,,, it cost me $350 to do the muffler delete at ACE Performance Exhaust ,,, selling it for $200, it’s not the loud part, it’s the drone that I didn’t want,,, nothing wrong with,, save your factory muffler and try this to see if you even like it first before cutting up for exhaust,,