RENNtech ECU HHT (HandHeldTuner) for the 209 - CLK 63 AMG Black Series. Up to 534 HP and 485 LB-FT LB-FT.
Gains: +34 HP & +20 LB-FT.

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.

CLK 63 AMG Black Series (W209) Stock Performance:

500 HP @ 6800 RPM; 465 LB-FT @ 5000 RPM

Upgraded Performance:

534 HP @ 6800 RPM; 485 LB-FT @ 5200 RPM

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