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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M273 Custom ECU Tune + Bolt-Ons
Up to +40 HP | Sharper throttle • Stronger mid-range • Refined V8 feel
Build Your Package:
1. Intake Filter
⬜ No Filter (Tune Only) ⬜ K&N Drop-In Filter ⬜ High-Flow (AFE / BMC)
2. X-Pipe
⬜ No X-Pipe ⬜ Add High-Flow X-Pipe (+$389)
3. Headers
⬜ No Headers ⬜ Add Mid-Length Headers (+$689) ⬜ Add Long Tube Headers (+$899)
1. Intake Filter
⬜ No Filter (Tune Only) ⬜ K&N Drop-In Filter ⬜ High-Flow (AFE / BMC)
2. X-Pipe
⬜ No X-Pipe ⬜ Add High-Flow X-Pipe (+$389)
3. Headers
⬜ No Headers ⬜ Add Mid-Length Headers (+$689) ⬜ Add Long Tube Headers (+$899)
✅ All options include the full custom M273 ECU tune + OBD cable + support
Choose your add-ons above and add the complete package to cart
M273 5.5L V8 Custom ECU Tune
The foundation of every build is our bespoke ECU calibration for your M273 V8 — not a generic flash. We refine throttle response, torque delivery, ignition timing, and fueling for a noticeable improvement in real-world driving.
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
Compatible Vehicles
- E550 • CLS550 • S550 • CL550 • SL550 • CLK550
How It Works
- Select your options above and complete purchase
- We send the OBD cable + read instructions
- Send us your stock file → receive your custom tune
Ready to build your perfect M273 setup?
