RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 Up to 523HP and 560LB-FT

Up to 523HP and 560LB-FT

CLASS S LONG (V 220) 55 AMG Kompressor [2 Filters Required] (HP: 500 | Year: 02 > 05)

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

RENNtech ECU Upgrade for 209 - CLK 350 AMG

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RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 Up to 523HP and 560LB-FTECU 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