BenzUnited Parts
Custom ECU Tune for Mercedes M273 V8 – E550, CLS550, CL550, S550, SL550
Custom ECU Tune for Mercedes M273 V8 – E550, CLS550, CL550, S550, SL550
Regular price
$1,195.00 USD
Regular price
$1,200.00 USD
Sale price
$1,195.00 USD
Unit price
per
Shipping calculated at checkout.
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Wake up your M273 5.5L V8 with sharper throttle, stronger mid-range torque, and refined power — all while keeping factory smoothness and reliability. Custom ECU Tune + Optional K&N Filters • X-Pipe • Headers (does not affect emissions)
What You Can Expect
- Up to +40 HP / +37 lb-ft on premium fuel
- Sharpened throttle with reduced delay
- Stronger mid-range torque for confident acceleration
- Smoother, more refined power delivery
- Factory safety systems fully retained
Exact Compatibility
| Model | Engine | Years | Body Styles |
|---|---|---|---|
| E550 / CLS550 | M273 5.5L V8 | 2006–2011 | Sedan / Coupe |
| S550 / CL550 | M273 5.5L V8 | 2006–2011 | Sedan / Coupe |
| SL550 | M273 5.5L V8 | 2006–2011 | Roadster |
| CLK550 | M273 5.5L V8 | 2006–2010 | Coupe / Cabriolet |
Frequently Asked Questions
Is this tune safe for my engine?
Yes. We keep all factory safety systems (knock, temperature, etc.) active and tune conservatively for long-term reliability.
How long does the process take?
Typically 2–4 business days after we receive your stock file.
Will it pass emissions / smog?
Yes. The tune, X-pipe, filters, and headers do not affect emissions as the factory cats are maintained.
Can I install hardware now and tune later?
Absolutely. The car runs reliably with the hardware even without the tune — but you’ll be leaving significant power on the table.
BenzUnited Parts • Mercedes Performance & Tuning
Fitment Guarantee • 30-Day Easy Returns
Fitment Guarantee • 30-Day Easy Returns
