RENNtech ECU Hand Held Tuner | HHT | 55 AMG | M113 - 5.5L V8 Kompressor

(4 reviews) Write a Review
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.

Available for:


  • 5
    Significant gains and smooth power delivery

    Posted by Kevin C on Jan 14th 2021

    I am very pleased with the power gains on my 2004 CL55 AMG with just the tune and high flow air filters. In addition to gains that you can feel across the power band, the car holds to redline and the delivery of power feels much smoother than with the factory tune. The throttle response is also much better and much smoother than the factory tune. Also, the ability to switch between factory and Renntech tune is a great feature and a simple procedure. Highly recommended upgrade for an already excellent car.

  • 5
    HHT E55

    Posted by Arc on Dec 22nd 2020

    Great throttle response, More power when you need it. No regrets!

  • 5
    HHT Tuner for SL 55

    Posted by Robert Gray on Oct 26th 2020

    I have owned the same SL 55 for sixteen years, and have had little time to use it. The HHT has renewed my interest in the vehicle. It was very easy to install and gave the car a very noticeable difference in acceleration while keeping the same luxury car feel. At 4850 lbs, that seems like quite a feat for a small investment. Thank you!

  • 5
    easy use, positive noticeable results

    Posted by tommy askin on May 18th 2020

    throttle response improved, torque improved