Mercedes 350 BlueEFFIENCY (3.5i) Tuning
Supported in 4 Mercedes models, 2004+.
Mercedes
15 supported 350 BlueEFFIENCY (3.5i) applications
Models With the Mercedes 350 BlueEFFIENCY (3.5i)
All Supported Mercedes 350 BlueEFFIENCY (3.5i) Tunes
| Model | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| C | 2010+ | W204 | 306 hp | ECU Bosch MED17.7.1 | AutoTuner |
| C | 2010+ | W204 | 306 hp | ECU Bosch MED17.7.3 | AutoTuner |
| C | 2010+ | W204 | 306 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| CLS | 2010+ | C218 | 306 hp | ECU Bosch MED17.7.1 | AutoTuner |
| CLS | 2010+ | C218 | 306 hp | ECU Bosch MED17.7.3 | AutoTuner |
| CLS | 2010+ | C218 | 306 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| E | 2009+ | W212 | 306 hp | ECU Bosch MED17.7.1 | AutoTuner |
| E | 2009+ | W212 | 306 hp | ECU Bosch MED17.7.3 | AutoTuner |
| E | 2009+ | W212 | 306 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| SLK | 2011+ | R172 | 306 hp | ECU Bosch MED17.7.1 | AutoTuner |
| SLK | 2011+ | R172 | 306 hp | ECU Bosch MED17.7.3 | AutoTuner |
| SLK | 2011+ | R172 | 306 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| SLK | 2004+ | R171 | 306 hp | ECU Bosch MED17.7.1 | AutoTuner |
| SLK | 2004+ | R171 | 306 hp | ECU Bosch MED17.7.3 | AutoTuner |
| SLK | 2004+ | R171 | 306 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
About Mercedes 350 BlueEFFIENCY (3.5i) tuning
We tune the Mercedes 350 BlueEFFIENCY (3.5i) in 15 applications across the C, CLS, E, SLK, from 2004+, in gasoline form, with stock outputs of 306 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: Bosch MED17.7.1, Bosch MED17.7.3, Siemens VGSx-NAG2.
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.