824 HP Stage 2 Performance Controller | BMW XMSTAGE 2 IS HERE FOR the XM! Performance Gains Horsepower Stock: 685 HP Tuned: 824 HP Torque Stock: 661 lb ft Tuned: 784 lb ft Measured at the San Jose, CA Dynamometer on 100 Octane 100 Octane Tuned Calculated Flywheel Power: Stock: 685 HP 661 lb ft Tuned: 824 HP 784 lb ft Gains: +139 HP +123 lb ft Measured Wheel Power: Stock: 562 HP 542 lb ft Tuned: 676 HP 643 lb ft Gains: +114 HP +101 lb ft 93 Octane Tuned Calculated Flywheel Power: Stock: 685 HP 661