Porsche 3.4 DFI S Tuning
Supported in 2 Porsche models, 2005+.
Porsche
5 supported 3.4 DFI S applications
Models With the Porsche 3.4 DFI S
All Supported Porsche 3.4 DFI S Tunes
| Model | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| Boxster | 2012+ | 981 | 315 hp | ECU Continental SDI9 | AutoTuner |
| Boxster | 2012+ | 981 | 325 hp | ECU Continental SDI9 | AutoTuner |
| Boxster | 2005+ | 987 | 320 hp | ECU Siemens SDI3 | AutoTuner |
| Cayman | 2013+ | 981 | 325 hp | ECU Continental SDI9 | AutoTuner |
| Cayman | 2006+ | 987 | 320 hp | ECU Siemens SDI3 | AutoTuner |
About Porsche 3.4 DFI S tuning
We tune the Porsche 3.4 DFI S in 5 applications across the Boxster, Cayman, from 2005+, in gasoline form, with stock outputs of 315-325 hp. Calibrations are written on AutoTuner for your exact hardware and fuel, then proven on our Dynojet 424xLC2 in Jenison, MI.
This engine runs on: Continental SDI9, Siemens SDI3.
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.