RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 - Front: 1

-  Front: 1

Up to 523HP and 560LB-FT

they deliver a distinctive

RENNtech ECU Upgrade for 209 - CLK 350 AMG

and performance of your Mercedes-AMG V8 with the RENNtech Low and Loud Package

RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 - Front: 1ECU Upgrade 500HP 605LB FT Gains: +26HP +67LB 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