Active Autowerke GEN3 is the best!!!
I got it in my car, and I love it, it looks nice, kinda stockish but very nice.
Sound? Sound is incredible I love it.
When I changed it, I didn't feel any sound difference between stock. But a couple of days ago I gave my car for a spin to my friend, and I almost peed my pants
I LOVE IT.
Sounds biased, but about a month ago I was looking for exhaust, and I heard just good impressions about AA exhaust systems.
Also AA GEN is the best for HP gain, but you not gonna feel anything.
Here is an independed dyno tests on some exhausts