RENNtech ECU Upgrade | Hand Held Tuner | HHT | 43 AMG | M276 - 3.0L V6 BiTurbo

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15.00 (in)
9.00 (in)
5.00 (in)
Minimum Purchase:
1 unit
Maximum Purchase:
1 unit

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.

The RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.

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.


  • 17-Digit VIN Number of vehicle is mandatory in order to program RENNtech HHT. Please send with order.
  • Please select applicable Octane/Fuel rating used in your vehicle/region at checkout.

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  • 5
    Excellent product! Highly recommended! 5 Stars!

    Posted by Alex Arenas on Dec 10th 2019

    I finally decided to pull the trigger and I picked up one of your HHTs for my vehicle, and I can safely say, that I have been very pleasantly surprised, it was exactly as described, easy to install, and a seamless integration and pairing with my vehicle. I highly recommend your place, your team, and your product. Thank you for the superb product and customer service. 5 Stars...

    Throughout the process, I have contacted them several times and dealt with several different sales people, different technical people, and even with the owner, Harmut, when no one else was there to take the call, and I must say.... AWESOME experience guys... Harmut, you have done a fantastic job at assembling a phenomenal team. They are knowledgeable, professional, patient, and enthusiastic. I picked up my vehicle in Stuttgart and drove it to Affalterbach to meet the person that designed it, and I congratulate you on keeping alive that same incredible spirit and dedication to perfection that I encountered during me brief stay there.