BenzUnited Parts
Custom M273 5.5L V8 ECU Tune + Bolt-On Upgrades for Mercedes E550, CLS550, S550, SL550 & CLK550
Custom M273 5.5L V8 ECU Tune + Bolt-On Upgrades for Mercedes E550, CLS550, S550, SL550 & CLK550
Regular price
$1,200.00 USD
Regular price
Sale price
$1,200.00 USD
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per
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Sharper throttle, stronger mid-range torque, and a much more responsive 5.5L V8 — all while keeping factory reliability and smoothness. Perfect for owners running downpipes, X-pipe, or headers.
Build Your Package: use the options above to add any of these to your tune —
• Drop-In Filters
• High-Flow X-Pipe
• Mid-Length Headers
• Drop-In Filters
• High-Flow X-Pipe
• Mid-Length Headers
What You Can Expect
- Up to +40 HP / +37 lb-ft on premium fuel
- Sharpened throttle with zero delay
- Stronger mid-range torque for confident acceleration
- Smoother, more refined power delivery
- All 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. All factory safety systems remain active with conservative tuning 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?
Yes. The tune itself does not affect emissions — factory cats remain in place. Note: adding a catless X-pipe or headers is for off-road/race use only.
Can I install hardware first and tune later?
Absolutely. The car runs great with the hardware — but you’ll be leaving serious power on the table without the tune.
BenzUnited Parts • Mercedes Performance & Tuning
Fitment Guarantee • 30-Day Easy Returns
Fitment Guarantee • 30-Day Easy Returns
