Mercedes 300 (3.5i) Tuning
Supported in 3 Mercedes models, 2009+.
Mercedes
9 supported 300 (3.5i) applications
Models With the Mercedes 300 (3.5i)
All Supported Mercedes 300 (3.5i) Tunes
| Model | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| CLS | 2010+ | C218 | 252 hp | ECU Bosch MED17.7.1 | AutoTuner |
| CLS | 2010+ | C218 | 252 hp | ECU Bosch MED17.7.3 | AutoTuner |
| CLS | 2010+ | C218 | 252 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| E | 2009+ | W212 | 252 hp | ECU Bosch MED17.7.1 | AutoTuner |
| E | 2009+ | W212 | 252 hp | ECU Bosch MED17.7.3 | AutoTuner |
| E | 2009+ | W212 | 252 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
| ML | 2011+ | W166 | 252 hp | ECU Bosch MED17.7.1 | AutoTuner |
| ML | 2011+ | W166 | 252 hp | ECU Bosch MED17.7.3 | AutoTuner |
| ML | 2011+ | W166 | 252 hp | TCU Siemens VGSx-NAG2 | AutoTuner |
About Mercedes 300 (3.5i) tuning
We tune the Mercedes 300 (3.5i) in 9 applications across the CLS, E, ML, from 2009+, in gasoline form, with stock outputs of 252 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.