BMW B58 Custom Tuning — Gen 1/Gen 2/Gen 3

BMW B58 custom tuning, built around your car

This is a true Undisputed custom calibration for the vehicle, hardware, fuel, transmission, and goals confirmed after checkout. It is not a generic one-file-fits-all map. Choose stock turbo, upgraded hybrid turbo, or full-frame turbo. The calibration is built for the confirmed fuel, HPFP/LPFP/port-injection system, boost-control strategy, and transmission.

Supported applications

Supported BMW B58 Gen 1, Gen 2, and compatible current-generation applications, including 240i/M240i, 340i/M340i, 440i/M440i, 540i, Z4 M40i, X3/X4 M40i, and supported Toyota Supra applications. Exact DME and access method are confirmed after checkout.

Included service

• Pre-session build and readiness review
• One confirmed hardware configuration and one primary fuel/map
• Scheduled remote connection and datalog review
• Calibration changes and revisions completed inside the purchased time block
• Direct communication with the Undisputed team throughout the scheduled session

After purchase and scheduling

Our team will email the address used at checkout to confirm the vehicle, hardware, fuel, tuning goals, and an available appointment time. Text or phone follow-up may be used when needed. Tuning sessions are scheduled in Eastern Time.

Included time: Stock Turbo — up to 3 hours. Upgraded Hybrid Turbo — up to 5 hours. Full-Frame Turbo — up to 6 hours. Time includes setup review, connecting, logging, calibration changes, revisions, troubleshooting, and communication.

Modern DME note: A compatible flash-platform license and any required DME unlock are separate unless explicitly stated. Many vehicles produced after June 2020 require an external unlock before tuning can begin.

Before the appointment

The car must be mechanically healthy, leak-free, fueled correctly, and ready to log. You will need a compatible computer/device, reliable internet, the required flashing platform, and any required cable or adapter. Hardware, dyno time, software licenses, unlock services, and repairs are not included unless specifically listed.

Why Undisputed

Undisputed brings professional calibration experience developed since 2017 across factory and standalone engine management, multiple fuel combinations, daily-driven street cars, and serious track builds—including 800+ horsepower applications for customers in the United States and abroad. Our standard is clear communication, useful data, clean drivability, and calibration decisions built around the actual vehicle.

Time and revision policy

This is a scheduled professional service, not an open-ended support window. Mechanical issues, connection problems, incomplete hardware, or incorrect fuel can consume the purchased time and may prevent completion. Work beyond the included block must be purchased through the Additional Calibration Time product and scheduled before more tuning continues. New turbos, injectors, fuel systems, fuels, engine combinations, or other major hardware changes may require additional time or a new tune.

Specific power is never guaranteed. Results depend on vehicle condition, hardware, fuel quality, environment, and safe operating limits. The customer is responsible for legal and emissions compliance; Undisputed will not calibrate public-road vehicles to defeat required emissions or safety systems.