M273 5.5L V8 ECU Performance Tune

The OE Tuning M273 ECU Tune is a performance enhancement for Mercedes-Benz vehicles equipped with the 5.5L V8 M273 engine. Key features include optimized fueling, refined ignition timing, improved throttle response for a more immediate connection to the engine, and the removal of the factory speed limiter. The process involves reflashing your original ECU to incorporate these performance enhancements. This ECU tune is specifically designed for naturally aspirated 5.5L V8 M273 engines. Compatible model years include 2005-2010 Mercedes-Benz CL500 (C216) and CLK500 (A209) vehicles. For enhanced functionality, it can be paired with a Weistec TCU tune. An optional Cypher Classic Handheld Programmer allows users to switch between their stock tune and the Weistec tune at any time. However, please note that the Cypher handheld programmer is not compatible with 2020+ models. This product is not street legal in all US states and is not legal for sale or use on pollution-controlled motor vehicles.