RENNtech | ECU Upgrade | X204 | GLK 350 BlueEFFICIENCY | 308HP/285LB-FT| 3.5L V6 NaturallyAspirated | M276 mercedes-benz-g-class--463---1990-2018--g-55-amg-esr3006970 CLASS S (W 221) 350

CLASS S (W 221) 350 V6 Blue Efficiency (HP: 306 | Year: 11 > )

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LIMITED LIFETIME WARRANTY All RENNtech Track Series wheels are sold with a lifetime structural warranty so you can be confident that you are using a high-performance wheel with factory backing

Renntech has partnered with Ohlins

Whether it’s a small deviation in the weave layup or a slight inconsistency in the finish

RENNtech | ECU Upgrade | X204 | GLK 350 BlueEFFICIENCY | 308HP/285LB-FT| 3.5L V6 NaturallyAspirated | M276 mercedes-benz-g-class--463---1990-2018--g-55-amg-esr3006970 CLASS S (W 221) 350RENNtech ECU Upgrade for 204 GLK 350 Blue Efficiency. Up to 308HP and 285LB FT. Gains: +6HP & 12LB FT RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980's! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability. RENNtechs