Siemens SDI3 ECU Tuning
Engine control unit used in 3 supported models from 1 make.
Porsche with the Siemens SDI3
All Porsche tunes- Porsche 9112004+997.1, 997.2 · 3.6 Carrera, 3.6 DFI, 3.6i Turbo, 3.8 DFI, 3.8 DFI Turbo, 3.8 DFI Turbo S, 3.8i DFI Carrera GTS, 3.8i DFI Carrera SAutoTuner
- Porsche Boxster2005+987 · 2.9 DFI 24v, 3.4 DFI S, 3.4i 24v SAutoTuner
- Porsche Cayman2006+987 · 2.9 DFI 24v, 3.4 DFI R, 3.4 DFI SAutoTuner
About Siemens SDI3 tuning
The Siemens SDI3 engine control unit is supported in 3 models from Porsche. 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.