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The Mercedes-AMG M156 6.2-litre naturally aspirated V8 is the engine that defined AMG’s modern era — powering the C63 (W204), E63 (W211/W212), CLK63, SL63, ML63, and the legendary SLS AMG. Unlike AMG’s current twin-turbo engines, the M156 relies entirely on displacement, high-revving capability, and airflow to make power. That makes exhaust modifications — particularly headers — one of the most effective ways to unlock additional performance from this engine. This guide covers the exhaust upgrade path for M156-equipped models, including long-tube headers, downpipes, and how these modifications pair with other performance upgrades. Why Headers Matter More on the M156 On...

What Is the Mercedes-AMG M156? The M156 is Mercedes-AMG's first independently designed engine — a 6.2-litre naturally aspirated V8 that debuted in 2006 and powered the C63 (W204), E63 (W212), ML63, CLK63, SLS AMG and several other chassis through 2015. Unlike the M113 and M155 that preceded it, the M156 was built from scratch by AMG in Affalterbach — hand-assembled, one man, one engine. It produces 451–622 HP depending on the application, with the SLS AMG sitting at the top of the range. The M156 is a dry-sump (SLS) or wet-sump (all others) design with forged steel crankshaft, aluminium block,...