Mercedes-Benz M CLK W163 C208 M112 Petrol Exhaust Manifold A1121403209 1-3 Cyl

Mercedes-Benz M CLK W163 C208 M112 Petrol Exhaust Manifold 1-3 Cyl is an original exhaust system component designed for petrol engines in Mercedes M-Class and CLK models. This used manifold, serving cylinders 1–3, ensures proper exhaust gas discharge from the right cylinder head, supporting stable engine operation and correct torque characteristics. Thanks to its factory geometry and fitment, it represents a reliable service solution for exhaust system repairs in Mercedes vehicles.

Specifications and technical data

• SKU: A1121403209
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1121403209
• Substitutable numbers: A1121403209, A 112 140 32 09, KZ
• Location on the vehicle: Right
• Fuel type: Petrol
• Category: Manifolds & Headers

Purpose and function in the exhaust system

The presented exhaust manifold belongs to the Exhaust manifolds category and is dedicated to M112 series petrol engines in Mercedes M-Class (W163) and CLK (C208) vehicles. Its task is to collect exhaust gases from the first three cylinders on the right side of the engine and direct them to the subsequent elements of the exhaust system, while maintaining appropriate flow and thermal resistance.

The factory design of the manifold ensures:

• stable exhaust gas flow under various engine loads,
• proper cooperation with sensors and other system components,
• maintenance of the correct backpressure, which promotes the smooth operation of the petrol unit.

Construction and fitment for the petrol engine

The manifold has been designed specifically for petrol units, which means it is adapted to higher exhaust temperatures and the operating characteristics of a spark-ignition engine. The placement on the right side of the engine requires precise routing of the exhaust channels to avoid thermal and mechanical stress in the engine bay.

Thanks to a design consistent with Mercedes factory standards, this component:

• fits the intended mounting points on the cylinder head,
• enables proper sealing of the connection with the head and the rest of the system,
• maintains the correct geometry of the exhaust channels, which reduces the risk of local overheating.

Service application and installation benefits

Choosing a used exhaust manifold for a Mercedes makes sense especially in the case of maintenance repairs, when the existing component has cracked, deformed, or corroded. Using an original dismantled manifold allows for maintaining factory flow parameters and compatibility with other exhaust system components.

The main benefits of installation include:

• maintaining the stock operating characteristics of the petrol engine,
• reducing the risk of leaks and blow-bys in the cylinder head area,
• easier installation due to compliance with factory geometry and mounting spacing.

Part selection by numbers and technical support

When selecting an exhaust manifold for a specific Mercedes vehicle, it is crucial to check compatibility using the OEM number and interchangeable numbers. It is worth verifying the fitment using vehicle data (model, generation, engine type) to ensure that the manifold will work with the existing exhaust system and engine accessories.

If you want to better understand the impact of the manifold on performance and exhaust system characteristics, as well as learn practical tips on selecting used components, check out the article: Performance exhaust system: used manifolds and sports catalytic converters on the road.

Expanding the exhaust system in a Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional manifolds, connecting sections, or transition elements, check out the available parts in the Mercedes exhaust manifolds category.

When making a decision about choosing a used component, it is also worth comparing it with new parts and replacements in terms of cost-effectiveness, quality, and fitment by OEM numbers – you will find a helpful comparison in the guide: Original, replacement, or used – which car parts are the most cost-effective?.