AMG CLA45 & A45 ECU Tuning — M133 Stage 1, 2, 3 & Stage 4 | YPG Motorsport

The Mercedes-AMG CLA45, A45, and GLA45 with the M133 2.0L turbocharged four-cylinder are some of the most underrated performance platforms in the GCC. The M133 holds the record for the world's most powerful production four-cylinder engine at 360–381 HP stock, and its tuning potential is extraordinary — Stage 4 builds with full forged internals and a single large turbo are capable of well over 700 HP from a 2.0L engine. YPG Motorsport tunes all M133 platforms across the CLA45, A45, and GLA45.

M133 Factory Power by Variant

  • CLA45 AMG / A45 AMG (pre-2019): 360–381 HP / 450 Nm
  • A45 S AMG (W177, 2019+): 421 HP / 500 Nm (M139 engine — contact YPG separately)

Stage 1 — YPG Flash Remote

Stage 1 ECU calibration via YPG Flash remote — no hardware required, OBD-based.

  • CLA45 / A45 Stage 1: 410–430 HP / +50–70 HP
  • Torque: 530–550 Nm / +80–100 Nm
  • Sharper throttle response and improved boost delivery from 2,000 RPM
  • More dramatic in-gear acceleration — the M133 at Stage 1 feels meaningfully faster than stock in real-world driving

Stage 2 — ECU + Catless Downpipe + Intake

  • Power: 470–500 HP
  • Torque: 580–620 Nm
  • Single catless downpipe on the M133 four-cylinder significantly reduces exhaust backpressure and improves spool time
  • The M133 with catless downpipe has a notably more characterful sound — the turbocharged four-cylinder develops a distinct character that the factory exhaust suppresses

Stage 3 — Upgraded Turbo

Stage 3 on the M133 involves upgrading to a larger single turbocharger — the factory twin-scroll turbo is replaced with a high-flow unit capable of supporting substantially more air volume. Stage 3 requires upgraded fuel system (port injection conversion or supplemental injectors), full supporting calibration via bench ECU, and typically an intercooler upgrade.

  • Stage 3 power: 550–650 HP depending on turbo specification
  • Fuel system upgrade mandatory
  • Bench ECU calibration required for Stage 3

Stage 4 — Full Forged Build

The M133 at Stage 4 with forged pistons, rods, crankshaft, upgraded turbocharger, full fuel system, and bench calibration is one of the most power-dense builds available — over 700 HP from a 2.0L displacement is achievable and has been built by YPG. Contact us for Stage 4 M133 build consultation.

GCC Calibration Notes

The M133 is sensitive to fuel octane — being a highly boosted four-cylinder, it is more susceptible to detonation than multi-cylinder engines with inherent firing order advantages. YPG GCC calibrations for the M133 are conservatively timed for 91–95 RON fuel availability and calibrated with IAT compensation for Gulf heat.

Pricing

  • Stage 1 YPG Flash: From $499 USD
  • Stage 2 calibration: From $699 USD (parts separate)
  • Stage 3/4: Contact for quote

Contact YPG Motorsport with your CLA45/A45 year, current mods, and location for a full quote.