2018-2023 BMW M5 Performance ECU Tune | F90

*Please email us any special requests*

Engineered with a performance-first mindset, GCA Performance ECU tuning redefines how your vehicle responds, pulls, and accelerates. This isn’t just added power—it’s a complete transformation in drivability. Throttle input becomes immediate, torque delivery is stronger and more consistent, and the entire powerband feels sharper and more responsive. From the mid-range surge to top-end pull, every part of the rev range is optimized to keep the car pushing harder, longer, and more efficiently. GCA Performance securely saves your factory ECU data, allowing you to revert your vehicle back to the stock settings at any time. 

We Stand Behind Our Products

• All items from us have a 1-Year Warranty! 

Tuning Specs

• Fits: 2018 2019 2020 2021 2022 2023 F90 BMW M5 M5 Competition 4.4L V8 Twin Turbo S63 Engine
• Downpipe readiness with check engine light suppression (for off-road use only)
• Enhanced exhaust acoustics with extended or adjustable burble
• Factory speed governor removal for unrestricted performance
• Octane-specific calibration tailored to your fuel quality
• Cold start behavior fully configurable (On/Off)
• 100% Reversible, always able to go back to stock at any time
• Stage 1 (Factory Downpipes) & Stage 2 (GCA Performance Downpipes) Tuning available (*We will clarify which Stage you need in the tuning instructions after purchase. We do not charge extra for Stage 2 tuning*)

Tuning Gains

• Horsepower Gain: 100 HP Increase
• Torque Gain: 100 TQ Increase

Tuning Instructions

• Once purchased, we will email you over instructions
• The car is able to be tuned via an ENET cable, which we will provide to you
• If you purchase the ECU unlock, we will also provide you with instructions for this 
• You will need to plug into a Windows computer to allow us to tune remotely
• For car's with build dates after June 2020 (6/2020+) the car's ECU comes locked from the factory, if you do NOT purchase the ECU unlock, you will need to arrange your own unlock before we are able to tune the ECU
• For car's with build dates before June 2020 (6/2020+) the car's ECU requires a bench unlock to tune

Shipping

• FREE SHIPPING to the lower 48 States!
• 5-8 Days total turn around time
• We ship all of our items through UPS or FedEx

We always recommend Professional Installation. 

DISCLAIMER: Removing, disabling, or altering emissions equipment on a pollution-controlled road vehicle is illegal. Installing devices or software that trick, disable, or modify emissions controls and monitors on a pollution-controlled road vehicle is also illegal. This product is sold only for racing, competition, track, hobby, or other off-road use. Its use is prohibited in any motor vehicle that is subject to emissions inspection or control. Installation and usage of after-market parts and software may impact drivability, reliability, emissions, insurance coverage and factory warranty. Legal in California only for racing vehicles that may never be used, or registered or licensed for use, upon a highway. All installation-risk and use-risk is borne by the end-user and installer of these parts.

German Car Accessories shipping & returns

• Shipping: orders typically ship within 1-2 business days; any lead time is stated on the product page.
• Returns: within 30 days of delivery, unused, in the same condition and original packaging with all contents. Installed parts and special-order items cannot be returned. Returns are handled case by case (arrived damaged, wrong item ordered, etc.).
• Shipping costs are non-refundable. Customers pay import duties and taxes on international orders.

To start a return or ask a question, contact us with your order number.