2021+ BMW M3/M4 Performance ECU Tune | G80/G82/G83

*Please email us any special requests*

Unlock the S58's true potential with this GCA Performance ECU tune, built for your 2021+ G80 M3 or G82/G83 M4. Throttle input becomes immediate, torque delivery gets stronger and more consistent, and the entire powerband feels sharper from mid-range surge to top-end pull.

Perfect for G80 M3 and G82/G83 M4 Competition owners running either factory or GCA Performance downpipes (Stage 1 or Stage 2 tuning covered at no extra cost), this tune adds 75 HP and 75 TQ. Your factory ECU data is saved securely, so you can always revert back to stock.

This isn’t just added power - it’s a complete transformation in drivability. 

We Stand Behind Our Products

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

Tuning Specs

• Fits: 2021 2022 2023 2024 2025 2026 2027 G80 G82 G83 BMW M3 M3 Competition M4 M4 Competition 3.0L I6 Twin Turbo S58 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: 75 HP Increase
• Torque Gain: 75 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 
• 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

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.