Underground Racing as you know is a tuner with only one obsession: make 1000-hp versions of the latest supercars. And they do it using their amazing twin-turbo kits. UR’s TT system for the Audi R8 V0 is now finished and available, and as always they released an awesome video to announce that. Check it out after the jump, and just look how this thing accelerates! It’s insane.