RENNtech ECU Upgrade – S 550 Coupé BiTurbo 4MATIC (C217 – 530HP/606TQ – M278 Engine)


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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.

Our ECU tune offers the biggest performance gains on the market translating to an astonishing 520 HP and 594 lb/ft at the crank!


S 550 Coupé (C217 – M278 Biturbo Engine) Stock Performance:

429 HP @ 5,250 RPM

516 LB-FT @ 1,800 RPM

Note: Mercedes M278 engine performance when measured obtains higher numbers that rated from factory.

 Modified Performance:

530 HP @ 4900 RPM

606 LB-FT @ 4100 RPM

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