M133

Mercedes M133 Turbo Inline-4

The M133 is AMG’s over-achieving 2.0L turbocharged four-cylinder used in the A45, CLA45, and GLA45.
It offers astonishing power in a compact package — and this page is your gateway to performance upgrades for M133-powered cars.

Specs & History

  • Displacement: 2.0L Turbocharged inline-4
  • Power Output: Factory ranges from ~355 HP to 381 HP depending on model/market
  • Usage: Found in A45 AMG, CLA45 AMG, GLA45 AMG
  • Engineering Highlights: Sporty turbo spool, strong head flow for its size, high-power potential
  • Limitations: Requires strong fueling and cooling as power levels increase beyond stock bounds

Performance & Upgrade Paths

  • Tune upgrades (map files) to maximize torque and power on stock hardware
  • Intercooler / charge-cooling upgrades, better pumps
  • Turbo upgrades / hybrid turbos (for higher bins)
  • Fueling upgrades for higher ethanol or boost targets
  • Exhaust / downpipes for less restriction

Why Upgrade the M133?

  • High Specific Output: The M133 already pushes high output from a small displacement — upgrades can unlock well beyond stock limits.
  • Thermal Control: Small engines respond quickly to heat, so managing intake temps is critical.
  • Balanced Builds: Because the platform is compact and light, even modest upgrades yield big performance gains.

Showing all 14 resultsSorted by popularity