RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 CLS 500 (C219) Stock Performance:

CLS 500 (C219) Stock Performance:

-  Front: 1

more powerful turbocharger that blows away anything else on the market

Stainless Steel Construction

RENNtech ECU Upgrade for 209 - CLK 350 AMG

RENNtech ECU Upgrade | X166 | GLS 550 | 500HP / 605LB-FT | 4.7L V8 BiTurbo | M278 porsche-panamera--970---2011-2015--panamera--s-e-hybrid-esr6964785 CLS 500 (C219) Stock Performance:ECU 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