2013 - 2020 Mercedes Benz SL550 - M278 V8 Bi-turbo 4.7L - Performance ECU Tuning

Performance Flash Tune for Mercedes Benz SL550 R231 with M278 4.7L V8 Bi-Turbo Engine with MED17.7.1/MED17.7.3 ECU.

Stage 1 M278 SL550 Performance Tune gains: 

    • 76WHP @ 3500RPM 
    • 118WTQ @ 3500RPM

Performance tuning modifies torque limiter maps, boost levels, fuel maps, ignition timing advance maps and more. All to help safely increase HP/TQ, while keeping good drive-ability and factory fail-safes/limp protection in place. Factory emissions remain functional and are not disabled. Gains can vary on vehicle condition and location.  

    • We do not offer cat delete software or tuning for emissions bypass.
    • We do not offer tuning services to the state of California. 

    We have 2 methods of having this R231 SL550 M278 ECU tune installed (Flash Type Selection).


    Remove the ECU and mail it in. We will create a full backup image of your ECU without opening the lid or any physical damage to the ECU at all. We then upload our tune and mail the ECU back. This is the safest way, as we can have a full backup of the entire ECU content.


    No downtime!!! With this option, once an order is placed, we will ship you a cable, that cable connects to a laptop and we are able to remote into your computer to flash the car. The remote flash option includes the cost of the cable (which is yours to keep). If we are out of cables for remote flashing, we can offer a cable for rent with a deposit. (We will message you if this happens). In some cases, not all cars can be flashed this way. In that case, you will have to ship your ECU to us for a bench flash. *You will need a Windows 8 or newer laptop and WIFI to flash remotely (Apple, Chromebooks are not supported)*

    Vehicle Fitment:

     - 2013 - 2020 Mercedes Benz - SL550 - R231 - M278 Twin Turbo 4.7L V8

    Please print out the tuning form below and mail it in with your ECU. If you're doing a remote flash you can email it.

    ECU Tuning Stage: M278 Stage 1 Performance Tune
    M278 Tune Flash Type: SL550 M278 Remote Flash
    In stock
    Sale price$625.00

    Tax excluded. Shipping calculated at checkout

    Mercedes Benz M278 ECU Tuning FAQs

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