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BenzUnited Parts

Custom ECU Tune for M273 V8 – E550, CLS550, CL550, S550, SL550

Custom ECU Tune for M273 V8 – E550, CLS550, CL550, S550, SL550

$850.00 USD
$1,200.00 USD $850.00 USD
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M273 V8 ECU Tuning — Precision. Performance. Personalization.

Gain up to +40 HP with a bespoke calibration for your naturally aspirated Mercedes-Benz V8.

Built for owners who want refined road manners with serious mid-range punch — not a one-size-fits-all file.

Custom ECU Tuning for Mercedes M273 V8 platforms

🔥 Why Tune Your M273?

The M273 is smooth, reliable, and restrained by conservative factory software. Our boutique calibration modernizes the platform — unlocking hidden performance while tailoring drivability to you. Sharper response when you want it, calm refinement when you don’t.

📈 What You Can Expect

Typical gains: up to +40 HP

  • Tailored throttle response — calibrated to your driving style for precise, confidence-inspiring control.
  • Fuel-map flexibility — 91 / 93 / 100 octane, selectable for your use case.
  • Optional exhaust burbles — set the character: off, subtle, or more pronounced.
  • Refined daily manners with immediate, elastic mid-range torque on demand.
  • Future-proof calibration — revision support as your setup evolves (intake, exhaust, etc.).
  • OEM safeguards retained — factory protections stay active; integration remains seamless.

🚚 How It Works

Service Only (Ship ECU to Us) – $850
Ship your ECU; we bench-flash and return it with your chosen settings: tailored throttle, optional burbles, and up to 3 fuel maps (91/93/100). Ideal for the simplest, most direct path to proven gains.

Service + MyGenius Handheld Programmer – $1,150
Same bespoke calibration — delivered remotely. Read your stock file, receive up to 3 maps (91/93/100), and flash at home. Includes tailored throttle and optional burbles. Keep the device for easy map swaps or revert-to-stock later. Preferred for control, flexibility, and long-term value.

🎯 Example Results

  • 5.5L baseline: 382 HP / 391 lb-ft → Tuned: ~425 HP / 428 lb-ft (premium fuel, healthy engine)

Actual gains vary with fuel quality, altitude, maintenance, and hardware condition.

🚘 Compatible Models

  • Mercedes-Benz E550
  • Mercedes-Benz CLS550
  • Mercedes-Benz S550
  • Mercedes-Benz CL550
  • Mercedes-Benz SL550
  • Mercedes-Benz CLK550

💬 What Drivers Say

“Silky at cruise, fierce when you lean on it. Exactly how a big-body Benz should feel.”
“Not a canned file — throttle and torque feel custom to my car. Worth every dollar.”

For discerning Mercedes owners who value refinement as much as performance — this is tuning as craftsmanship, not commodity.

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