Very cool!
Here are some other Muffler Delete Designs for comparison.
I've never ridden in a Turner Exhaust car before and I've always run my muffler delete system without resonators so I can't speak on whether one design or another helps to defeat drone because I have always experienced a lot of drone due to my decision to run without resonators, but it is definitely interesting what Fabspeed has done. Would be interesting to ride in a FabSpeed M5 versus a Turner M5 for comparison.
Top to bottom:
1. Hartge
2. Turner
3. RPi