Hey guys, first post here! Recently purchased my first C5 RS6 and loving it!
The previous owner flashed the ecu with Unitronic stage 1. I was wondering if anyone has any feedback on this software? Is it safe/powerful compared to other options?
Between Revo, Uni, MTM, Jfonz and Viper, which is the most aggressive and which is safest? Note, I left out GIAC as I've heard it's unsafe.
I'm ready to reflash the ecu with a better tune!

Thanks!