RENNtech ECU Upgrade | C218 | CLS 550 | 480HP / 605LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2018 mercedes-benz-clk-class--208---1997-2003--clk-320-esr5032578 RENNtech ECU Upgrade for 164

RENNtech ECU Upgrade for 164 - ML 350

W222 - S63 AMG Sedan | MY2018+

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RENNtech ECU Upgrade | C218 | CLS 550 | 480HP / 605LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2018 mercedes-benz-clk-class--208---1997-2003--clk-320-esr5032578 RENNtech ECU Upgrade for 164ECU Upgrade 480HP 605LB FT Gains: +45HP 162Lb FT Our intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or