My car was loaded, had everything but the the JBL stereo option. So, since I work at an MB dealership I got the JBL tweeters (and covers) plugged in plug the existing wires and slid the new speakers on! Fastest mod I have ever had, 3 minutes and two screw total. I get a very generous employee discount and the speakers and enclosure still cost me $150! But, they are OEM and look great.
I have JBL 6.5" dual cones waiting in a box, plus amp. Have another box with a Kenwood underseat 8" self amplified sub-woofer. Since the interior is the size of a breadbox, I am sure it will rock as strong as my similar system (Kenwood) in the 2015 Brabus!
The boxes will have to sit where they are till the Oregon weather warms up. Too damn cold to hang out in the garage!
Have added Dynamat Xtreme to the back cargo area under service access panel. Also, added it to the plastic interior of the storage area on the tailgate. Then pulled the carpet back exposing the wall behind the seats and used it here too! What a world of difference in road noise! Waiting till I have time to install the new door speakers and amp, Then I will use a 2ft by 1ft panel of the same Dynamat inside each door exterior door panel when the door speakers and subwoofer go in.