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RENNtech | ECU Upgrade | X204 | GLK 350 BlueEFFICIENCY | 308HP/285LB-FT| 3.5L V6 NaturallyAspirated | M276

RENNtech ECU Upgrade for 204 - GLK 350 Blue Efficiency. Up to 308HP and 285LB-FT.
Gains: +6HP & 12LB-FT
SKU: ECU:54.204.GLK350BE
Retail price without tax: $995.00

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.

RENNtech’s tuning software for Mercedes offers significant gains performance across the vehicle’s entire power band. By modifying torque output limits, optimizing ignition timing, perfecting variable valve timing and refining boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.


GLK 350 BlueEFFICIENCY (X204-M276 Engine) Stock Performance:

  • 302 HP; 273 LB-FT


Modified Performance:

  • 308 HP; 285 LB-FT @ 3500 RPM



  • +6 HP & +12 TQ


Contact us

7825 SW Ellipse Way, Stuart, FL 34997
(+1) 561 - 845 7888
Mon - Fri 9am - 6pm


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7825 SW Ellipse Way - Stuart, FL 34997
TEL: 561.845.7888 FAX: 561.845.6777 E-MAIL: