Mercedes SLK 55 AMG (5.5i) 422 hp — Stage 1 file (+28 hp)

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Chip tuning for Mercedes SLK 55 AMG (5.5i) 422 hp ECU

Mercedes SLK (2011 - R172) 55 AMG (5.5i) 422 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 422 to 450 hp (+28 hp, +7%) and torque from 540 to 570 Nm (+30 Nm). This engine ships with different ECU variants: Bosch MED17.7.1, Bosch MED17.7.3. The flashing method is determined by the specific unit: OBD, Bench or Boot mode. In the CHIPOK database: 2 configurations · 2 ECU variants. A petrol engine built in 2011 — a Tricore platform without strong protection; OBD access works.

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 Mercedes slogan is 'Das Beste oder nichts' ('The best or nothing'). Mercedes encryption is among the toughest in the industry, especially on modern models. Top AMG engines offer significant potential with a downpipe + intake. AMG is Mercedes's performance division (since 1967), acquired by Mercedes in 1999.

AMG engines confidently reach Stage 2 with a downpipe + intake. Mercedes is one of the most protected brands in the chip tuning industry in terms of encryption. The AMG community is active in Germany, but the protection is the toughest in the industry, so Stage 1 on AMG usually requires Bench. 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). Brabus is a premium alternative to AMG for the top models.

Frequently asked questions

How many horsepower does the Mercedes SLK 55 AMG (5.5i) 422 hp reach after a remap?

Stage 1 for the Mercedes SLK 55 AMG (5.5i) 422 hp adds +28 hp — power increases from 422 to 450 hp (+7%). Torque rises from 540 to 570 Nm (+30 Nm).

What does a Stage 1 remap of the Mercedes SLK 55 AMG (5.5i) 422 hp include?

Stage 1 is a software optimization of the factory ECU firmware of the Mercedes SLK with no hardware changes. The injection, boost, ignition-timing and torque maps are reprogrammed. The gain is +28 hp with no hardware changes.

Does Stage 1 make sense on the Mercedes SLK 55 AMG (5.5i) 422 hp with this much power?

On the top-spec Mercedes SLK 55 AMG (5.5i) 422 hp engine, Stage 1 is the starting point before Stage 2 with a downpipe, intake and a larger intercooler. The mass-market factory calibration leaves substantial headroom for an aggressive software tune.

What is Stage 2 for the Mercedes SLK 55 AMG (5.5i) 422 hp?

Stage 2 for the Mercedes SLK 55 AMG (5.5i) 422 hp is Stage 1 plus hardware changes: a downpipe, a larger intake and a performance intercooler. The gain is considerably higher, but it requires professional component selection.

Which control units is the Mercedes SLK 55 AMG (5.5i) 422 hp built with?

The Mercedes SLK 55 AMG (5.5i) 422 hp comes with 2 ECU variants: Bosch MED17.7.1, Bosch MED17.7.3. Calibration is done for the specific unit after the revision is identified.

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

After remapping the Mercedes SLK, 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 SLK?

Reading and writing via OBD takes 25-30 minutes on the Mercedes SLK. 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 SLK?

Before Stage 1 the original of the Mercedes SLK 55 AMG (5.5i) 422 hp is read out and saved — returning to the factory state is possible at any time.

How much does chip tuning the Mercedes SLK 55 AMG (5.5i) 422 hp cost?

The remap price for the Mercedes SLK 55 AMG (5.5i) 422 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