Exhaust Headers for Mercedes Benz C220 C230 SLK230 (1994-2004) 2.2L 2.3L

High-Flow T-304 Stainless Steel Exhaust Headers for 1994-2004 Mercedes Benz C-Class, SLK-Class (M111/W202/R170)

What it Does: Replaces the restrictive factory cast iron manifold with a mandrel-bent 4-2-1 stainless steel header to reduce backpressure and improve exhaust scavenging efficiency.

The Stock C-Class, SLK-Class M111 Manifold Weakness

The factory exhaust manifold on the M111 engine is a heavy, cast-iron log-style unit designed primarily for cost-effective mass production and noise suppression. These units are notorious for internal turbulence; exhaust pulses from one cylinder often collide with those of another, creating significant backpressure that traps heat and spent gases within the combustion chamber. Over time, the thermal stress of heat-cycling leads to hairline fractures in the cast material, particularly on the 2.3L Kompressor variants where higher EGTs (Exhaust Gas Temperatures) are common. This thermal retention not only hinders volumetric efficiency but also accelerates the degradation of surrounding engine bay components due to excessive heat soak.

The Engineering Solution

This performance header is engineered with a 4-2-1 (Tri-Y) design specifically tuned to enhance mid-range torque and throttle response. Constructed from premium T-304 stainless steel, the assembly provides superior corrosion resistance and a significant weight reduction over the OEM manifold. Each runner is precision mandrel-bent to maintain a consistent 1.5-inch diameter, merging into a 2-inch collector to optimize exhaust gas velocity. The CNC-machined flanges ensure a warp-resistant seal against the cylinder head, while the TIG-welded joints provide maximum structural integrity under high-vibration conditions. By improving the scavenging effect—using the vacuum created by one exhaust pulse to pull the next—this header reduces pumping losses and allows the M111 to breathe more freely.

Technical Specifications

Compatibility

• 1994-1996 Mercedes-Benz C220 (W202) 2.2L
• 1997-2000 Mercedes-Benz C230 (W202) 2.3L
• 1998-2004 Mercedes-Benz SLK230 (R170) 2.3L

The Mercedes Benz Precision Standard

European performance platforms like the W202 and R170 require components that maintain tight tolerances to prevent CEL (Check Engine Light) issues and ensure proper fitment within a cramped engine bay. This stainless steel header provides the precision and durability needed to optimize the M111's forced induction or naturally aspirated airflow without compromising the vehicle's structural integrity.