513 HP Stage 2 ECU Software | BMW M240i/M340i/M440i/Z4M40i Generation 2 B58

Unlock the full potential of the Gen 2 B58 with CarBahn Stage 2 ECU Software. Developed through extensive dyno testing, the calibration optimizes boost, ignition timing, fueling, and torque delivery to produce significantly more power while maintaining the smooth, predictable drivability expected from a BMW. On 93 octane, Stage 2 delivers an additional 74 horsepower and 73 lb-ft of torque at the flywheel. With 100-octane fuel, output climbs to an estimated 513 horsepower and 570 lb-ft of torque—gains of nearly 100 horsepower and 100 lb-ft over stock. The result is stronger acceleration throughout the rev range, sharper throttle response, and substantial midrange torque without sacrificing everyday refinement. Performance Results Fuel Configuration Flywheel Power Wheel Power — OEM Stock 415 HP / 473 lb-ft 341 HP / 388 lb-ft 93 Octane Stage 2 489 HP / 546 lb-ft 401 HP / 448 lb-ft 100 Octane Stage 2 513 HP / 570 lb-ft 421 HP / 468 lb-ft Gains Over Stock 93 octane: +74 HP and +73 lb-ft at the flywheel 93 octane: +60 WHP and +60 lb-ft at the wheels 100 octane: +98 HP and +97 lb-ft at the flywheel 100 octane: +80 WHP and +80 lb-ft at the wheels Improved throttle response and midrange acceleration Smooth, factory-like power delivery Calibrations available for up to 100-octane fuel Power figures represent CarBahn test results under controlled conditions. Actual output may vary depending on vehicle condition, fuel quality, installed hardware, environmental conditions, and dyno type.