RENNtech ECU HHT (HandHeldTuner) for the 219 - CLS 500. Up to 320HP and 355 LB-FT LB-FT.
Gains: +18HP & +16LB-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.

CLS 500 (C219) Stock Performance:

302 HP @ 5600 RPM; 339 LB-FT @ 2700-4250 RPM

Gains:

320 HP @ 5600 RPM; 355 LB-FT @ 3000-4600 RPM

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