Description
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Unlock the full performance potential of your 2016-2019 Mercedes-Benz GLS400/GLS450 X166/W166 with the GCA Performance ECU Tune from German Car Accessories. Engineered with a performance-first approach, this custom ECU calibration transforms the way your luxury SUV responds, accelerates, and delivers power.
Designed specifically for the 3.0L Twin Turbo V6 M276 engine, the GCA Performance tune optimizes throttle response, torque delivery, and overall engine performance. Experience sharper acceleration, stronger mid-range power, and improved responsiveness throughout the entire RPM range.
This ECU upgrade is more than a simple horsepower increase. Every aspect of the engine calibration is refined to improve drivability, power delivery, and performance while maintaining the comfort and reliability expected from the Mercedes-Benz GLS-Class.
GCA Performance securely saves your original ECU data, allowing your vehicle to be restored back to factory settings at any time. With Stage 1 and Stage 2 tuning options available, this tune can be customized for vehicles running factory downpipes or upgraded with GCA Performance Downpipes.
We Stand Behind Our Products
- All items from German Car Accessories include a 1-Year Warranty
Fitment
Fits:
2016 2017 2018 2019 X166/W166 Mercedes-Benz GLS400 / GLS450
Engine:
3.0L Twin Turbo V6 M276 Engine
Features & Benefits
- Designed by German Car Accessories under the GCA Performance line
- Custom ECU tuning for Mercedes-Benz GLS400 and GLS450 models
- Improved throttle response and acceleration
- Increased horsepower and torque output
- Optimized turbocharger performance
- Enhanced torque delivery throughout the RPM range
- Octane-specific calibration tailored to fuel quality
- Factory speed limiter removal
- Adjustable exhaust acoustics with burble settings
- Configurable cold start behavior (On/Off)
- Downpipe readiness with check engine light suppression (for off-road use only)
- Stage 1 and Stage 2 tuning support
- Factory ECU data securely saved
- 100% reversible back to stock settings
- Remote tuning through provided cable
Tuning Specs
- Stage 1: Designed for vehicles with factory downpipes
- Stage 2: Designed for vehicles equipped with GCA Performance Downpipes
- Horsepower Gain: +60 HP
- Torque Gain: +60 TQ
Tuning Instructions
- Once purchased, tuning instructions will be emailed to you.
- The vehicle can be tuned remotely using the provided cable.
- Stage selection will be confirmed through the tuning instructions after purchase.
- Follow the included instructions to complete the ECU calibration process.
