Our proprietary ECU upgrade for the Mercedes M278 Biturbo engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability.

With the newest update of their Software Upgrade for the M278 – 4.7L V8 BiTurbo, RENNtech boosts the 550-Series to AMG Power Levels. The RENNtech upgraded M278 now produces 540 HP and 705 LB-FT at crank.

Compared to power numbers by Mercedes-Benz, the E 550 gains up to 105 HP and 197 LB-FT. This Software update delivers up to 10 HP and 99 LB-FT more than the previous version.

The vast amount of increased torque across the entire RPM range gives the 550 an extra edge to compete with AMG powered vehicles. All this without sacrificing around town comfort and daily driver reliability.

 C207 - E 550 Coupe – M278 | 4.7L V8 BiTurbo Stock Performance:

• Rated by Mercedes-Benz:       402 HP @ 5,250-5,550 RPM  |  443 LB-FT @ 1,800-3,500 RPM
• Rated by RENNtech:                435 HP @ 4,900 RPM  |  508 LB-FT @ 2,350-3,650 RPM 

 C207 - E 550 Coupe – M278 | 4.7L V8 BiTurbo RENNtech Upgraded Performance:

*Applies to all Models, crank power calculation based on 17% Drivetrain loss on 4-MATIC models

• Rated by RENNtech:           540 HP @ 4,500 RPM  |  705 LB-FT @ 2,850-3,450 RPM

                                                       448 awhp @ 4,500 RPM  |  585 awtq @ 2,850-3,450 RPM