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The Mercedes-AMG M133 2.0-litre turbocharged four-cylinder is the engine behind AMG’s compact performance lineup — the A45 (W176), CLA45 (C117), and GLA45 (X156). From the factory, the M133 produces up to 381 HP in its final specification, making it one of the most powerful production 2.0T engines ever built. But with the right turbo upgrade, the M133 is capable of significantly more — well beyond 500 WHP on pump fuel. This guide covers the turbo upgrade path for all M133-equipped models, including the Stage 4 turbo kit and the supporting modifications needed to extract its full potential. Factory M133 Turbo...

The Mercedes-AMG 45-series — A45, CLA45, and GLA45 — packs a remarkable amount of performance into a compact package. The M133 2.0-liter turbocharged inline-4 was the most powerful series-production four-cylinder engine in the world when it launched, and it remains one of the most tunable platforms in the AMG lineup. A single downpipe replacement is the highest-impact bolt-on modification you can make to this engine.This guide covers everything you need to know about upgrading the downpipe on your M133-powered AMG: catless versus high-flow catted options, real-world power gains, exhaust sound transformation, fitment across all 45-series models, and why an ECU...