Regardless of hp claims, APR is one of the best tunes out there for the RS6. I had it on my other RS6 and its a rocket, with excellent data logs. The...
Contact Rich@vipertuning.com. He'll code out your O2 sensors so that cel won't come up. Also have him do left foot braking. I did what he calls stage...
I have the Euro tails on mine now. They are the all red version. I personally like the smoked version from hella, and if I found a set to buy I would...