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Unlock the full performance potential of your 2019+ BMW M8 with the German Car Accessories GCA Performance ECU Tune. Designed specifically for the F91 M8 Convertible, F92 M8 Coupe, and F93 M8 Gran Coupe, this performance calibration is engineered for BMW’s powerful 4.4L Twin Turbo V8 S63 engine to deliver sharper response, stronger acceleration, and optimized power delivery.

Developed with a performance-first mindset, the German Car Accessories GCA Performance ECU Tune transforms the way your BMW M8 responds under acceleration. Throttle input becomes more immediate, torque delivery becomes stronger and more consistent, and the entire powerband is optimized for improved performance from the mid-range pull to the top-end RPM range.

GCA Performance securely saves your factory ECU data before tuning, allowing you to restore your vehicle back to the original factory software settings at any time. Whether you are looking for improved street performance or maximum power from the S63 twin-turbo V8 engine, this ECU tune provides a complete upgrade in drivability while maintaining full reversibility.

Vehicle Fitment

Fits the following BMW models:

• 2019-2026 BMW M8 Coupe (F92)
• 2019-2026 BMW M8 Convertible (F91)
• 2019-2026 BMW M8 Gran Coupe (F93)

Engine Compatibility:

• 4.4L Twin Turbo V8 (S63 Engine)

Features

• Developed by German Car Accessories under the GCA Performance lineup
• Custom ECU calibration engineered specifically for the BMW S63 twin-turbo V8 engine
• Increased horsepower and torque throughout the RPM range
• Improved throttle response for quicker acceleration
• Stronger and more consistent torque delivery
• Optimized power delivery from mid-range acceleration to top-end performance
• Downpipe readiness with check engine light suppression (for off-road use only)
• Enhanced exhaust acoustics with extended or adjustable burble settings
• Factory speed governor removal for unrestricted performance
• Octane-specific calibration tailored to your fuel quality
• Fully configurable cold start behavior (On/Off)
• 100% reversible ECU tuning with the ability to return to stock settings at any time
• Stage 1 tuning available for vehicles with factory downpipes
• Stage 2 tuning available for vehicles equipped with German Car Accessories Performance Downpipes
• No additional charge for Stage 2 tuning
• Stage selection will be confirmed after purchase during the tuning process

Performance Gains

• Horsepower Gain: 120 HP Increase
• Torque Gain: 120 TQ Increase

Actual performance gains may vary depending on fuel quality, vehicle condition, supporting modifications, and environmental conditions.

Tuning Instructions

• Once purchased, tuning instructions will be emailed to you
• The vehicle can be tuned using an ENET cable, which is provided with your purchase
• If you purchase the ECU Unlock service, additional unlock instructions will also be provided
• Vehicles with build dates after June 2020 (06/2020+) come equipped with factory-locked ECUs
• If you do not purchase the ECU Unlock service, you will need to arrange your own ECU unlock before tuning can be completed

Warranty

• All German Car Accessories products include a 1-Year Warranty
• Factory ECU data is securely saved, allowing the vehicle to be restored to stock settings at any time