Description
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Unlock the full performance potential of your 2016-2019 Mercedes-Benz GLS550 with the German Car Accessories Performance ECU Tune. Developed by German Car Accessories (GCA) under our GCA Performance line, this precision ECU calibration is specifically engineered for the 4.7L Twin Turbo M278 V8, delivering substantial gains in horsepower, torque, throttle response, and overall drivability.
Engineered with a performance-first philosophy, this ECU tune transforms how your GLS550 responds to every throttle input. Turbo spool is quicker, acceleration becomes more immediate, and torque delivery is stronger and more consistent throughout the RPM range. Whether you're daily driving, towing, or cruising on long highway journeys, the optimized calibration provides smoother power delivery, improved throttle response, and a significantly more engaging driving experience.
Every GCA Performance ECU Tune is custom-calibrated to your vehicle and fuel quality, ensuring reliable power gains while maintaining factory drivability. Both Stage 1 and Stage 2 calibrations are available. Stage 1 is designed for vehicles equipped with factory downpipes, while Stage 2 is optimized for vehicles fitted with GCA Performance Downpipes. There is no additional charge for Stage 2 tuning.
Additional performance features include factory speed limiter removal, configurable cold start operation, adjustable exhaust burble settings, and check engine light suppression for compatible off-road downpipe applications. Before tuning begins, your factory ECU software is securely backed up, allowing your vehicle to be returned to stock settings whenever desired.
Following your purchase, German Car Accessories provides the required programming cable along with detailed flashing instructions, allowing you to safely tune your ECU from home.
Every GCA Performance ECU Tune is backed by a 1-Year Warranty.
Fitment
Fits:
- 2016-2019 Mercedes-Benz GLS550
- W166 / X166 Chassis
- 4.7L Twin Turbo V8 M278 Engine
Performance Gains
- Up to 100 HP Increase
- Up to 100 lb-ft Torque Increase
Features
- Designed by German Car Accessories (GCA)
- GCA Performance ECU Calibration
- Stage 1 Tuning Available
- Stage 2 Tuning Available (GCA Performance Downpipes)
- No Additional Charge for Stage 2 Calibration
- Faster Throttle Response
- Improved Turbo Response
- Increased Horsepower and Torque
- Optimized Powerband Performance
- Octane-Specific ECU Calibration
- Factory Speed Limiter Removal
- Adjustable or Extended Exhaust Burble
- Configurable Cold Start Function (On/Off)
- Downpipe Check Engine Light Suppression (Off-Road Use Only)
- Factory ECU File Securely Backed Up
- 100% Reversible to Factory Software
- Programming Cable Included
- Detailed Installation Instructions Provided After Purchase
- Backed by a 1-Year Warranty
Specifications
- Brand: German Car Accessories
- Product: Performance ECU Tune
- Vehicle: Mercedes-Benz GLS550
- Chassis: W166 / X166
- Engine: 4.7L Twin Turbo V8 M278
- Tuning Stages: Stage 1 / Stage 2
- Installation Method: ECU Flash via Included Programming Cable
