Aah.... that's from 153kW to 184kW ATW, still a substantial gain but not as huge as you're thinking!
Tips for reading dyno graphs: lower 2 lines are torque at flywheel and boost, higher lines are power at the wheels. Red lines are standard tune, blue lines are with the ChipTorque Custom Flash Tune - these are described in the key in box on top left of every graph.