Short answer: From model year 2021, Mercedes uses highly protected MD1 and MG1 control units in many models, which can no longer be directly modified with common tools (KESS3, Flex, CMD, Autotuner). Stefanel Performance handles the entire process as a mail-in service: send in your control unit, we unlock it internally, flash the individual optimization (Stage 1/2, VMAX) and send it back to you ready to install — install and drive.
Performance optimization for modern Mercedes control units – we handle everything for you!
From model year 2021, Mercedes uses modern, highly protected engine control units of types MD1 and MG1 in many models. These can no longer be directly modified with common tools such as KESS3, Flex, CMD, or Autotuner.
👉 Stefanel Performance offers you the solution:
We process your control unit completely in-house – including opening, processing, and professional optimization.
🔧 How it works:
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You send us your control unit (MD1 or MG1)
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We perform the necessary unlocking internally
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We upload the suitable, individually tuned software (e.g., Stage 1, Stage 2, VMAX removal, etc.) directly in-house
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You receive the fully optimized control unit back – just install and drive!
‼️ Important:
It is not possible to access the control unit again yourself or with other tools after our modification.
The optimization is carried out exclusively by us – access remains locked thereafter.
✅ Your advantages:
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Optimization also for models from 2021
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No need for tools or software
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Individual calibration directly by us
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No open or manipulable control unit – maximum security
🔍 Typical vehicles with MD1 / MG1 (from 2021):
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Mercedes C-Class W206
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Mercedes S-Class W223
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Mercedes GLE V167
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Mercedes A-Class W177 Facelift
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Mercedes G-Class from 2021
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many other models – have VIN checked!
⚠️ Note on legality:
The software optimization we offer is not approved for public roads and may only be used on test benches, racetracks, or private property.
📞 Contact & Inquiry:
📞 Phone: 📞 +49 (0) 8031 409 2134
💬 WhatsApp: Message now
Hashtags:
#StefanelPerformance #MercedesTuning #MD1Tuning #MG1Tuning #Stage1Mercedes #Chiptuning2021 #ECUTuning #MercedesW206 #MercedesGLE #ECUOptimization #EngineManagement
