2010-2014 Mercedes-Benz CL550 Performance ECU Tune | C216/W216

*Please email us any special requests* Engineered with a performance-first mindset, GCA Performance ECU tuning redefines how your vehicle responds, pulls, and accelerates. This isn’t just added power—it’s a complete transformation in drivability. Throttle input becomes immediate, torque delivery is stronger and more consistent, and the entire powerband feels sharper and more responsive. From the mid-range surge to top-end pull, every part of the rev range is optimized to keep the car pushing harder, longer, and more efficiently. GCA Performance securely saves your factory ECU data, allowing you to revert your vehicle back to the stock settings at any time.  We Stand Behind Our Products All items from us have a 1-Year Warranty!  Tuning Specs Fits: 2010 2011 2012 2013 2014 C216 W216 Mercedes CL550 RWD CL550 4MATIC 4.7L V8 Twin Turbo M278 Engine Downpipe readiness with check engine light suppression (for off-road use only) Enhanced exhaust acoustics with extended or adjustable burble Factory speed governor removal for unrestricted performance Octane-specific calibration tailored to your fuel quality Cold start behavior fully configurable (On/Off) 100% Reversible, always able to go back to stock at any time Stage 1 (Factory Downpipes) & Stage 2 (GCA Performance Downpipes) Tuning available (*We will clarify which Stage you need in the tuning instructions after purchase. We do not charge extra for Stage 2 tuning*) Tuning Gains Horsepower Gain: 120 HP Increase Torque Gain: 150 TQ Increase Tuning Instructions Once purchased, we will email you over instructions The car is able to be tuned via a cable, which we will provide to you Shipping FREE SHIPPING to the lower 48 States! 5-8 Days total turn around time We ship all of our items through UPS or FedEx We always recommend Professional Installation.  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 after-market 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, or registered or licensed for use, upon a highway. All installation-risk and use-risk is borne by the end-user and installer of these parts.