My miltek is on my b6 s4, is it still showing in my sig on a computer? It's a great exhaust on that but I can't comment on the b8 version.
I have the scorpion on my 8.5, because of the drone issues I had with the custom one and the scorpion being marketed as drone free it was the only option for me.
It's come in for some bad press recently because of fitment issues. Mine, like as it seems everyone else's didn't fit 100% so I took it to scorpion who made it fit exactly as I wanted it.
Drone doesn't seem to bother some people, it made me feel sick. There is a review thread on here somewhere where someone reviewed a few different ones.
Tread carefully, it's a fair chunk of cash and can ruin your whole driving experience!