TunedMercedes M271 Tune

Description

Wake Up Your M271

This calibration tightens torque limits, optimizes boost/load targets, and cleans up throttle mapping so your C250 feels lighter and stronger everywhere—without turning it into a handful.

What You’ll Notice

• Earlier, stronger torque with smoother delivery
• Faster tip-in and more predictable throttle (less “soft” feel)
• Cleaner upshifts when paired with a TCU tune
• Adaptation settles over a few drives; most gains are immediate

Choose Your Fuel & Stage

Package	Hardware	Fuel	Notes
Stage 1 — 91/93	Stock hardware	91 or 93 AKI	Daily-friendly baseline; big mid-range delta. ~253hp
Stage 1 — E30 Blend	Stock hardware	E30 (approx.)	Extra knock headroom; best response on stock parts. ~ 275hp
Stage 2 — 93	High-flow downpipe	93 AKI	Lower backpressure; stronger top-end repeatability. ~299hp

Results vary with health, altitude, fuel quality, ambient temps, and drivetrain. If you track/dyno, we’ll review logs and tailor as needed.

What’s Included

• Custom ECU calibration for your fuel/hardware
• Remote OBD flash (Windows laptop + stable internet)
• Data review & one revision window
• Return-to-stock file on request

How It Works

1. Prep: Confirm software variant, fuel, and hardware.
2. Read: Connect interface; we remote in and read the file.
3. Tune: We build the calibration for your goals.
4. Flash & Drive: We write the file and guide first-drive checks.

Fitment

M271 (C250 W204). If unsure, add your VIN in Order Notes and we’ll confirm before shipping.

Recommended Supporting Mods

• TCU Tune (722.9) — cleaner upshifts at added torque
• Fresh one-step-colder plugs if high mileage
• Healthy coils/filters; consider intercooler or heat-management upgrades for hot climates

FAQ

91 vs 93 vs E30?

We offer safe 91 and stronger 93 files. E30 provides additional knock margin for the best response on stock hardware.

Emissions / readiness?

We do not provide emissions defeat. On compliant hardware, street files retain normal readiness behavior.

Can I go back to stock?

Yes—request your stock file and we’ll support return-to-stock.

Policies & Notes

No emissions defeat is provided or implied. Tuning may affect drivetrain wear and dealer warranty. Our liability is limited to the transaction amount. Start from a healthy baseline vehicle.

Add to Cart — C250 M271 Tune