RENNtech ECU Upgrade | Hand Held Tuner | HHT | AMG GT | M178 - 4.0L V8 BiTurbo | Single-Scroll

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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.


50-State Street Legal RENNtech HHT

The HHT for Mercedes-Benz and Mercedes-AMG, 4.0 L BiTurbo V8, M176 | 177 | 178, engines is EPA Emissions compliant and street legal in all 50 States.

This product conforms to EPA Emission Standards and does not reduce effectiveness of your vehicles original pollution control systems.

A CARB Executive Order was granted to the RENNtech HHT based on emission test results in the modified configuration, an examination of the On-Board Diagnostic II (OBD II) system, and an engineering evaluation.

 50 State Logo Tag



  • 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
    RENNtech ECU Upgrade | Hand Held Tuner | HHT | AMG GT | M178 - 4.0L V8 BiTurbo |

    Posted by David Phillips on Dec 17th 2020

    Love this upgrade! Installed exactly as advertised. Super easy and the performance is absolutely noticeable! I would highly recommend this as a tuning solution.

  • 5
    handheld for AMG GT

    Posted by kevin on Nov 30th 2019

    very easy less than 1 min installed program. very good product and my car gain lot of power . Felt like unleash the beast now haha