Mercedes C 55 AMG (5.5i) 367 hp — Stage 1 file (+18 hp)

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Chip tuning for Mercedes C 55 AMG (5.5i) 367 hp ECU

Mercedes C (2004 - W203) 55 AMG (5.5i) 367 hp — premium petrol engine of the passenger segment of the Mercedes-Benz Group AG (Mercedes-Benz, AMG, Maybach, Smart, EQ) group (Германия, 1926). Stage 1 chip tuning raises power from 367 to 385 hp (+18 hp, +5%) and torque from 510 to 535 Nm (+25 Nm). ECU — Bosch ME2.8. Flashing method: OBD or Bench depending on the unit's protection. The 2004 generation — old-era petrol ECUs (ME7/ME9/MED9/Simos) with easily readable memory.

Mercedes is one of the most protected brands in the chip tuning industry in terms of encryption. Maybach is Mercedes's ultra-luxury sub-brand. Mercedes-Benz is the world's oldest carmaker, founded in 1926 by the merger of Daimler-Motoren-Gesellschaft and Benz & Cie. The factory calibration on Mercedes petrol engines is conservative, leaving headroom for Stage 1. On older-generation Mercedes petrol engines, Stage 1 is flashed over OBD without Bench. The AMG 'one engineer, one engine' principle means each engine is built by a single craftsman whose signature appears on the plaque.

The AMG community is active in Germany, but the protection is the toughest in the industry, so Stage 1 on AMG usually requires Bench. Stage 1 on Mercedes often requires refreshing the adaptations after the flash. Mercedes is one of the most protected brands in the chip tuning industry in terms of encryption. AMG Performance Studio is Mercedes's in-house tuning studio for bespoke projects. Bench reading is a mandatory procedure for modern AMG models. Top AMG engines sit at the Mercedes power ceiling, and the gain is significant. AMG engines are a well-known base once hardware is added (downpipe + intake + intercooler).

Frequently asked questions

What power gain do you get after chip tuning the Mercedes C 55 AMG (5.5i) 367 hp?

The Stage 1 gain for the Mercedes C 55 AMG (5.5i) 367 hp is 18 hp (+5%) over the stock 367 hp, for a total of 385 hp. Torque rises from 510 to 535 Nm (+25 Nm).

What is Stage 1 chip tuning for the Mercedes C?

Stage 1 is a software optimization of the factory ECU firmware of the Mercedes C with no hardware changes. The injection, boost, ignition-timing and torque maps are reprogrammed. The gain is +18 hp with no hardware changes.

Does Stage 1 make sense on the Mercedes C 55 AMG (5.5i) 367 hp with this much power?

Stage 1 for the Mercedes C 55 AMG (5.5i) 367 hp unlocks the potential built in by the factory but artificially capped to meet mass-market targets. A base of 750-800 hp is achievable once hardware is added.

What is Stage 2 for the Mercedes C 55 AMG (5.5i) 367 hp?

Stage 2 on the Mercedes C 55 AMG (5.5i) 367 hp means software + hardware (exhaust, intake, intercooler). The gain depends on the specific hardware combination.

What ECU platform does the Mercedes C 55 AMG (5.5i) 367 hp use?

The Mercedes C 55 AMG (5.5i) 367 hp is fitted with the Bosch ME2.8 ECU. The read method depends on the unit's protection: OBD, Bench via BDM, or Boot mode.

Does the factory warranty of the Mercedes C remain valid after Stage 1?

After remapping the Mercedes C, the official factory warranty on the engine and gearbox is lost (this applies to any manufacturer when the ECU is modified). CHIPOK guarantees the quality of the calibration and free revisions.

How long is the wait for a Stage 1 remap for the Mercedes C?

Reading and writing via OBD takes 25-30 minutes on the Mercedes C. Bench reading (BDM/JTAG) takes about 60 minutes plus refitting. Remote file processing at CHIPOK takes 5-30 minutes.

How do you roll back to the factory firmware of the Mercedes C?

Before Stage 1 the original of the Mercedes C 55 AMG (5.5i) 367 hp is read out and saved — returning to the factory state is possible at any time.

How much does chip tuning the Mercedes C 55 AMG (5.5i) 367 hp cost?

The remap price for the Mercedes C 55 AMG (5.5i) 367 hp is dynamic and is calculated in the CHIPOK calculator based on the selected options. A credit-based payment model, with no subscription fees.

Last updated: 30.08.2026 · Source: manufacturer technical documentation · Measurements: CHIPOK dyno