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

Engineered with a performance-first mindset, the GCA Performance ECU Tune transforms your 2024+ Mercedes GLS450 into a more responsive and powerful SUV. This software upgrade optimizes your engine calibration to improve throttle response, torque delivery, acceleration, and overall drivability.

Unlike basic power upgrades, GCA Performance tuning refines the entire powerband, delivering stronger low-end torque, improved mid-range pull, and enhanced top-end performance. Every adjustment is designed to make your GLS450 feel more responsive while maintaining factory-like reliability.

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

We Stand Behind Our Products

All GCA Performance products include a 1-Year Warranty.

Fitment

Fits:

• 2024 Mercedes GLS450
• 2025 Mercedes GLS450
• 2026 Mercedes GLS450
• X167 / W167 Mercedes-Benz GLS-Class
• 3.0L Turbo Inline-6 M256 Engine

Key Features

• Custom ECU calibration designed specifically for the Mercedes M256 engine
• Improved throttle response and acceleration
• Increased horsepower and torque output
• Enhanced torque delivery throughout the RPM range
• Octane-specific tuning based on fuel quality
• Factory speed limiter removal for unrestricted performance
• Adjustable exhaust burble settings
• Configurable cold start behavior (On/Off)
• Downpipe readiness with check engine light suppression (for off-road use only)
• Fully reversible ECU calibration — return to stock anytime
• Stage 1 tuning available with factory downpipes
• Stage 2 tuning available with GCA Performance downpipes

Performance Gains

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

The vehicle includes factory torque and horsepower limitations. For maximum performance gains, we recommend installing a CPC module.

Without a CPC module, expected gains may be limited to approximately:

• +60 HP
• +60 TQ

Tuning Instructions

• After purchase, tuning instructions will be emailed to you.
• The vehicle can be tuned through a provided tuning cable.
• If ECU unlocking is required, additional instructions will be provided.
• Vehicles with factory ECU locks will require unlocking before tuning can be completed.

Professional installation is always recommended.

Disclaimer

Removing, disabling, or modifying emissions equipment on a pollution-controlled road vehicle may violate local laws and regulations. This product is intended only for racing, competition, track, hobby, or other off-road applications where permitted.

Installation of aftermarket software may affect drivability, reliability, emissions compliance, insurance coverage, and factory warranty coverage. All installation and usage risks are the responsibility of the end user and installer.