Custom ECU Tuning for M273 5.5L V8 – E550, CLS550, S550,

CL550, SL550 4.6L

Gain up to +36 HP and +30 lb-ft with our performance ECU calibration.*

Extract maximum power and efficiency from your naturally aspirated Mercedes-Benz V8 with our custom ECU tuning for the M273 platform. Whether you drive a 5.5L or 4.6L variant, this tune optimizes performance while maintaining OEM-level reliability and smoothness.

💥 Why Tune Your M273?

• +36 HP / +30 lb-ft Gains: Enhanced ignition timing, throttle response, and torque maps.
• OEM Safety Retained: All factory protections remain active for long-term reliability.
• Bespoke Calibration: Available options include adjusted throttle sensitivity, burble tuning, and fuel mapping for 91–100 octane.
• Seamless Integration: Tune is undetectable at dealerships using factory-level tools and checksums.

📌 Compatible Models

• Mercedes-Benz E550 (2011–2017)
• Mercedes-Benz CLS550 (2012–2015)
• Mercedes-Benz CL550 (2011–2014)
• Mercedes-Benz S550 (2011–2017)
• Mercedes-Benz SL550 (2012–2016)
• Mercedes-Benz CLK550 (2008–2012)

📝 How It Works

We extract your vehicle’s original ECU software, safely enhance the tuning maps for more power and response, and reflash the ECU with improved performance parameters using OEM-grade tools.

🎯 Proven Gains

• 5.5L Stock: 382 HP / 391 lb-ft → Tuned: 418 HP / 421 lb-ft
• 4.6L Stock: 335 HP / 339 lb-ft → Tuned: 368 HP / 370 lb-ft

*Results based on premium fuel and optimal engine condition. Individual gains may vary.

📞 Have Questions?

We're here to help. Contact us to learn more about tuning options for your M273-powered Mercedes.