Description
CarBahn Performance Stage 2 ECU Software Power Package is engineered for BMW G8X M3 and M4 Competition models equipped with the S58 engine and automatic transmission. The package combines CarBahn Stage 2 ECU software with a heat exchanger and high-performance air filters to deliver substantial increases in horsepower and torque while maintaining the vehicle's existing safety systems.
On 93-octane fuel, the Stage 2 calibration produces up to 735 flywheel horsepower and 668 lb-ft of flywheel torque on Competition models. With 100-octane fuel, output increases to 754 flywheel horsepower and 679 lb-ft of flywheel torque.
For Competition RWD models, measured output reaches 648 WHP and 584 lb-ft of wheel torque on 100-octane fuel. Competition xDrive models produce up to 618 WHP and 557 lb-ft of wheel torque on 100-octane fuel.
CarBahn EVO Intelligent software seamlessly adapts to various fuel octane levels, optimizing performance without compromising safety. It retains existing safety features while adding additional protection as needed.
The package includes Stage 2 software, a CarBahn heat exchanger, and CarBahn High Performance air filters. The factory top-speed governor is removed.
The software was developed with the CarBahn heat exchanger installed to achieve the claimed power output. The heat exchanger is required for the matching factory warranty.
Important: This package can only be installed at an Authorized CarBahn dealer and is compatible with automatic transmission-equipped models only. Manual transmission models are not supported.
Performance Specifications
Competition RWD – 93 Octane
OEM Stock
- Flywheel Horsepower: 591 HP
- Flywheel Torque: 575 lb-ft
- Wheel Horsepower: 508 WHP
- Wheel Torque: 494 lb-ft
Tuned
- Flywheel Horsepower: 735 HP
- Flywheel Torque: 668 lb-ft
- Wheel Horsepower: 632 WHP
- Wheel Torque: 574 lb-ft
Competition RWD – 100 Octane
Tuned
- Flywheel Horsepower: 754 HP
- Flywheel Torque: 679 lb-ft
- Wheel Horsepower: 648 WHP
- Wheel Torque: 584 lb-ft
Competition xDrive – 93 Octane
OEM Stock
- Flywheel Horsepower: 591 HP
- Flywheel Torque: 575 lb-ft
- Wheel Horsepower: 484 WHP
- Wheel Torque: 471 lb-ft
Tuned
- Flywheel Horsepower: 735 HP
- Flywheel Torque: 668 lb-ft
- Wheel Horsepower: 602 WHP
- Wheel Torque: 548 lb-ft
Competition xDrive – 100 Octane
Tuned
- Flywheel Horsepower: 754 HP
- Flywheel Torque: 679 lb-ft
- Wheel Horsepower: 618 WHP
- Wheel Torque: 557 lb-ft
Package Includes
- CarBahn Stage 2 ECU Software
- CarBahn Heat Exchanger
- CarBahn High Performance Air Filters
- Top-speed governor removal
- CarBahn EVO Intelligent software with adaptive fuel-octane optimization
Fitment
Make: BMW
Model(s): M3 Competition, M3 Competition xDrive, M3 CS, M4 Competition, and M4 Competition xDrive
Vehicle Year(s): 2021, 2022, 2023, 2024, 2025, and 2026
Transmission(s): Automatic
Chassis: G80, G82, and G83
Body Style(s): Coupe, Sedan, and Convertible
Drivetrain(s): xDrive and RWD
Part Number: CBG8X-9001
Fits Engines: S58
Installation: Dealer Install Only
This power package is designed for 2021–2026 BMW G80 M3, G82 M4, and G83 M4 models, including M3 Competition, M3 Competition xDrive, M3 CS, M4 Competition, and M4 Competition xDrive, equipped with the S58 engine and automatic transmission.
Transmission Requirement: Fits automatic transmission-equipped models only. Manual transmission-equipped models are not included.
Installation Requirement: This package can ONLY be installed at an Authorized CarBahn dealer.
Warranty Requirement: The software was developed with the CarBahn heat exchanger installed to achieve the claimed power output, and the heat exchanger is required for the matching factory warranty.
