BenzUnited Parts
Custom M276 3.5L V6 ECU Tune for Mercedes C350, E350, GLK350, ML350
Custom M276 3.5L V6 ECU Tune for Mercedes C350, E350, GLK350, ML350
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Optimize throttle mapping, torque delivery, ignition timing, and fueling on your M276 3.5L naturally aspirated V6.
What You Can Expect
- 302 HP → 320 HP and 273 lb-ft → 285 lb-ft on premium fuel — tune only
- Further gains when combined with high-flow filters and X-pipe
- Sharper throttle response with no lag
- Stronger mid-range torque for confident acceleration
- Smoother power delivery and refined drivability
- Factory safety systems fully retained
Exact Compatibility
| Model | Years | Engine |
|---|---|---|
| C350 / C300 4MATIC | 2012–2015 | M276 3.5L V6 |
| E350 | 2012–2017 | M276 3.5L V6 |
| GLK350 | 2013–2015 | M276 3.5L V6 |
| ML350 / GLE350 | 2012–2018 | M276 3.5L V6 |
| SLK350 | 2012–2016 | M276 3.5L V6 |
Naturally aspirated M276 only. Not for the M276 3.0L BiTurbo found in the C43, C450, E43, and GLC43 — see our dedicated M276 BiTurbo tune for those.
Frequently Asked Questions
Is this tune safe for my engine?
Yes. We keep all factory safety systems active and tune conservatively for long-term reliability.
How long does the process take?
Typically 2–4 business days after we receive your stock ECU file. Ship us your ECU, or use the included OBD data cable to pull and flash your file remotely from your own driveway.
Will it pass emissions / smog?
The tune, K&N filters, and X-pipe do not remove any emissions equipment — your factory catalytic converters are retained.
Can I install the hardware first and tune later?
Absolutely. The car runs reliably with the filters and X-pipe even without the tune — but you’ll be leaving significant power on the table.
What fuel does it require?
91 octane or higher after tuning. The calibration is built around premium fuel so it can make the power safely.
Can I go back to stock?
Yes. We archive your original factory file, so your ECU can be returned to stock at any time.
