RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 mercedes-benz-e-class-coupe--238---2017-present--e53-amg-esr5923220 Any parts with more noticeable

Any parts with more noticeable areas of concern are scrapped entirely and never offered to our highly discerning clientele

0L Engine) Stock Performance:

Street-Legal and/or Non-Performance tires

RENNtech Carbon Fiber Fender Extractors | GT | GTS | GTC | GT R | GT R Pro

Crank Performance Numbers are calculated with a 14% Drivetrain loss on 4MATIC+ vehicles

RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 mercedes-benz-e-class-coupe--238---2017-present--e53-amg-esr5923220 Any parts with more noticeableECU+ Upgrade 540HP 705LB FT Gains: +66HP +167LB FT RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be