I've heard that it's a hard engine to extract power from. I wonder that he asked the tuner to map it specifically to produce less torque. It just seems really low compared even to the other cars in the video. The mate had his tuner map the cars engine to produce less torque to put the clutch, gearbox and drive shafts under less stress. It must be the injection timing that can reduce the torque but keep the horsepower value up.
Nice cars though. That 611nm must feel amazing. The bi-turbo audi RS4 puts out that with a remap but has 425 bhp.