Siemens MSD81 ECU Tuning
Engine control unit used in 12 supported models from 2 makes.
Alpina with the Siemens MSD81
All Alpina tunes- Alpina B32007+35i (N54)AutoTuner
- Alpina B3 S2008+35i (N54)AutoTuner
BMW with the Siemens MSD81
All BMW tunes- BMW 1-serie2005+E81-E87, E81-E87-LCI · 16i (1.6i), 16i (2.0i), 18i, 25i (3.0), 35i (N54)AutoTuner
- BMW 1M2011+E82 · 3.0i (M)AutoTuner
- BMW 3-serie1998+E46, E90, E90-LCI, E92, E93 · 16i (1.6i), 18i, 25i (3.0), 30i, 35i (N54), 35is (N54)AutoTuner
- BMW 5-serie2003+E60 · 25i (3.0), 30i, 35i (N54)AutoTuner
- BMW 6-serie2004+E63 · 30iAutoTuner
- BMW X12009+E84 · 18i, 25i (3.0)AutoTuner
- BMW X32003+E83 · 25i (3.0), 30iAutoTuner
- BMW X52007+E70 · 30i, 35i (N54)AutoTuner
- BMW X62008+E71 · 35i (N54)AutoTuner
- BMW Z42002+E85-E86, E89 · 25i (3.0), 35i (N54), 35is (N54)AutoTuner
About Siemens MSD81 tuning
The Siemens MSD81 engine control unit is supported in 12 models from Alpina, 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.
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.