Siemens MSS65 ECU Tuning
Engine control unit used in 2 supported models from 1 make.
BMW with the Siemens MSS65
All BMW tunesAbout Siemens MSS65 tuning
The Siemens MSS65 engine control unit is supported in 2 models from BMW. 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.
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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.