Siemens SIM4LE ECU Tuning
Engine control unit used in 4 supported models from 1 make.
Mercedes with the Siemens SIM4LE
All Mercedes tunes- Mercedes C2000+W203 · 200 Kompressor (2.0k), 230 Kompressor (2.3k)AutoTuner
- Mercedes CLK1998+W208 · 200 Kompressor (2.0k), 230 Kompressor (2.3k)AutoTuner
- Mercedes E1995+W210 · 200 Kompressor (2.0k), 230 Kompressor (2.3k)AutoTuner
- Mercedes SLK2000+R170 · 200 Kompressor (2.0k), 230 Kompressor (2.3k)AutoTuner
About Siemens SIM4LE tuning
The Siemens SIM4LE engine control unit is supported in 4 models from Mercedes. We read, modify, and flash it with AutoTuner, then verify the result on our Dynojet 424xLC2 in Jenison, MI. A custom calibration optimizes fueling, ignition timing, boost, and torque limits for your exact build.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.