Description
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 2012-2015 Mercedes-Benz GL450 or GL550 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.
Designed with performance at its core, this ECU tune transforms how your GL-Class accelerates and responds. Turbo spool is quicker, throttle response becomes noticeably sharper, and torque delivery is stronger across the entire RPM range. Whether you're driving around town, towing, or cruising on the highway, your GL450 or GL550 will benefit from smoother power delivery, stronger acceleration, and a more engaging driving experience.
Every GCA Performance ECU Tune is custom-calibrated to your vehicle and fuel quality, ensuring optimized performance while maintaining reliability. Both Stage 1 and Stage 2 calibrations are available. Stage 1 is intended for vehicles with factory downpipes, while Stage 2 is optimized for vehicles equipped with GCA Performance Downpipes. There is no additional charge for Stage 2 tuning.
Additional tuning 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 original ECU software is securely backed up, allowing your vehicle to be restored to factory settings whenever desired.
After purchase, German Car Accessories supplies the required programming cable and comprehensive installation instructions, allowing you to flash your ECU safely and conveniently from home.
Every GCA Performance ECU Tune is backed by a 1-Year Warranty.
Fitment
Fits:
- 2012-2015 Mercedes-Benz GL450
- 2012-2015 Mercedes-Benz GL550
- W166 / X166 Chassis
- 4.7L Twin Turbo V8 M278 Engine
Performance Gains
- Up to 60 HP Increase
- Up to 60 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 GL450 / GL550
- Chassis: W166 / X166
- Engine: 4.7L Twin Turbo V8 M278
- Tuning Stages: Stage 1 / Stage 2
- Installation Method: ECU Flash via Included Programming Cable
