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RENNtech HHT ECU Upgrade for GL 320 CDI (X164- 253 HP / 464 LB-FT)

RENNtech HHT ECU Performance Upgrade for 166 - GL 320 CDI. up to 253HP and 464LB-FT.
Gains: +23HP & 75LB-FT
SKU: ECU:54.164.GL320CDI
Retail price without tax: $1,190.00


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 reflashed at any time as many times as you wish.

RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! 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 tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes.



GL 320 CDI (X164) Stock Performance:

  • 230 HP / 389 LB-FT


Modified Performance:

  • 253 HP / 464 LB-FT



  • +23 HP / +75 LB-FT



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: