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

CarBahn Stage 2 Power Package — Gen 2 B58 Unlock the full potential of the Gen 2 B58 with a complete, matched combination of performance software, upgraded cooling, and improved airflow. The CarBahn Stage 2 Power Package includes: CarBahn Stage 2 ECU Software CarBahn High-Performance Heat Exchanger FREE CarBahn B58 High-Flow Air Filters Developed through extensive dyno testing, the Stage 2 calibration optimizes boost, ignition timing, fueling, and torque delivery to produce significantly more power while preserving 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 98 horsepower and 97 lb-ft over stock. Power That Stays Consistent More boost creates more heat, and rising intake-air temperatures can cause the factory ECU to reduce ignition timing and power. The included high-performance heat exchanger helps control that heat so the engine can deliver stronger, more repeatable performance during sustained acceleration, mountain driving, hot-weather use, and repeated pulls. Its motorsport-grade bar-and-plate core uses optimized end-tank geometry, increased thermal surface area, and F1-derived thermal-efficiency technology to improve heat rejection while maintaining coolant velocity and airflow efficiency. The result is lower, more stable intake-air temperatures with reduced heat soak, timing pull, and power fade. CarBahn rates this heat exchanger design for up to 40% greater cooling capacity than the factory system. Heat exchanger technical details The included B58 high-flow air filters complement the software and cooling upgrades by improving airflow through the factory airboxes—at no additional cost with this package. 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 Reduced heat soak and more consistent power under sustained load Smooth, factory-like power delivery Calibrations available for fuel up to 100 octane FREE B58 high-flow air filters included 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.