M256 3.0L EQ Boost Power Module

The RENNtech Power Module (RPM) ECU tune is engineered to significantly boost horsepower and torque across the entire power band for the Mercedes-Benz M256 3.0 Inline 6 cylinder EQ Boost engine. By precisely adjusting boost mapping and maintaining optimized air-to-fuel ratios, this module effectively shifts the power and torque curve upward. This upgrade results in substantial gains, delivering an estimated +50 HP and +74 LB-FT, bringing the engine's output to up to 417 HP and 442 LB-FT, based on dyno-measured figures. The module itself is housed within a robust, CNC-machined 6061 aluminum enclosure, featuring pre-labeled wires and connectors for straightforward integration. For added flexibility, the RENNtech Power Module includes a bypass that allows the vehicle's performance to be quickly returned to stock settings by installing the bypass in place of the module. The entire harness can also be uninstalled for a complete return to the original factory configuration. RENNtech's over 30 years of ECU tuning experience, coupled with extensive research and long-term testing, ensures a product that excels in quality, performance, and reliability. Fitment includes the E 450 (W213 / S213 chassis), CLS 450 (C257 chassis), GLE 450 (V167 chassis), and GLS 450 (X167 chassis). Professional installation is recommended. A buyer beware note advises that increasing power output without upgrading the stock turbocharger on the M256 engine may increase the risk of turbo failure, as failures have been reported with the stock turbo units.