RENNtech Intermediate ECU Upgrade - E 550 Coupe BiTurbo | C207 | 480HP/523 LB-FT | M278 Engine | MY2012-2013 mercedes-benz-sl-class--230---2007-2011--sl-600-esr9561245 Rated by RENNtech: 601 HP

Rated by RENNtech:               601 HP @ 5

and improved throttle reponse

and faster shifting times

774 LB-FT @ 3

Our proprietary Rolls Royce ECU upgrade offers rock solid performance from RENNtech

RENNtech Intermediate ECU Upgrade - E 550 Coupe BiTurbo | C207 | 480HP/523 LB-FT | M278 Engine | MY2012-2013 mercedes-benz-sl-class--230---2007-2011--sl-600-esr9561245 Rated by RENNtech: 601 HPRENNtech Intermediate ECU Upgrade for 207 E 550 BiTurbo. Up to 480HP and 523 LB FT. Gains: +78HP & +80 LB 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