[sparoz]

What everyone is missing is the tail end of the power curve between the S63 and the S63Tu. The former drops like all turbo does, while the later stays flat. They have managed to stretch the redline from 6800 to 7200, while maintaining the same torque to the redline. That's where the extra psi has gone into --> makes it able to maintain power right to the redline at 7200. Graph on the right is the X5m torque curve.