Disclaimer : Cancellations within 24 hours are subject to a cancellation fee. After 24 hours, a higher fee will apply.

Unlock the full potential of your 2024+ Mercedes-Benz G500/G550 with the GCA Performance ECU Tune. Engineered with a performance-first approach, this ECU calibration transforms the way your G-Class delivers power, torque, and throttle response.

This is more than a simple horsepower upgrade — it is a complete improvement in drivability. Throttle input becomes sharper, torque delivery is stronger and more consistent, and the entire powerband feels more responsive. From everyday acceleration to full-throttle performance, every aspect of engine behavior is optimized to provide a more engaging driving experience.

GCA Performance securely saves your factory ECU data, allowing your vehicle to be returned to the original factory settings at any time.

We Stand Behind Our Products

• All GCA Performance products include a 1-Year Warranty
• Factory ECU settings can be restored at any time
• Professional installation recommended

Fitment

Fits:

• 2024 Mercedes-Benz G500
• 2024 Mercedes-Benz G550
• 2025 Mercedes-Benz G500
• 2025 Mercedes-Benz G550
• 2026 Mercedes-Benz G500
• 2026 Mercedes-Benz G550

Chassis:

• W464
• W465

Engine:

• 3.0L Turbo Inline-6
• M256 Engine

Tuning Specs

• 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 optimized for your fuel quality
• Fully configurable cold start behavior (On/Off)
• 100% reversible — return to factory settings anytime
• Stage 1 (Factory Downpipes) and Stage 2 (GCA Performance Downpipes) tuning available
  After purchase, tuning instructions will confirm the correct stage required. No additional charge for Stage 2 tuning.

Tuning Gains

• Horsepower Gain: +75 HP
• Torque Gain: +100 TQ

Additional Notes:

• The vehicle comes with a factory Torque & Horsepower limiter.
• A CPC module is recommended to maximize performance gains.
• Without the CPC module, gains of approximately +60 HP and +60 TQ can still be achieved.
• The ECU comes locked from the factory. If an ECU unlock is not purchased, the customer must arrange an ECU unlock before tuning can be performed.

Tuning Instructions

• After purchase, tuning instructions will be emailed to you.
• The vehicle can be tuned through a cable provided by GCA Performance.
• If an ECU unlock is purchased, additional unlock instructions will also be provided.
• Professional installation is always recommended.

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 aftermarket 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, registered, or licensed for highway use.

All installation and usage risks are assumed by the end-user and installer.