Siemens MS45 ECU Tuning
Engine control unit used in 9 supported models from 2 makes.
BMW with the Siemens MS45
All BMW tunes- BMW 1-serie2005+E81-E87, E81-E87-LCI · 20i, 28iAutoTuner
- BMW 3-serie1998+E46, E90, E90-LCI, E92, E93 · 20i, 25i, 25ti, 28i, 30iAutoTuner
- BMW 5-serie1995+E39, E60 · 2.2i, 2.5i, 3.0i, 20i, 25i, 28i, 30iAutoTuner
- BMW 7-serie2001+E65-E66 · 3.0i, 30iAutoTuner
- BMW X32003+E83 · 2.5i, 3.0i, 25iAutoTuner
- BMW X52000+E53 · 30iAutoTuner
- BMW Z31995+E36 · 2.2i, 2.5i, 3.0i, 30iAutoTuner
- BMW Z42002+E85-E86 · 2.2i, 2.5i, 3.0i, 25i, 30iAutoTuner
Wiesmann with the Siemens MS45
All Wiesmann tunes- Wiesmann GT / Roadster2003+3.2i (MF3)AutoTuner
About Siemens MS45 tuning
The Siemens MS45 engine control unit is supported in 9 models from BMW, Wiesmann. 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.