Mercede W210 W220 M112 Petrol Exhaust Manifold 4-6 Cyl A1121402709

The MERCEDES E S W210 W220 M112 Exhaust Manifold 4-6 is a factory exhaust system component designed for M112 gasoline engines, mounted on the left side of the power unit. The original channel geometry ensures proper exhaust gas removal from cylinders 4–6, stable engine operation, and maintenance of factory performance parameters. This is a solution for users who want to technically restore the exhaust system's efficiency in a Mercedes E-Class or S-Class W210 / W220 generation.

Specifications and technical data

• SKU: A1121402709
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1121402709
• Substitutable numbers: A1121402709, A 112 140 27 09, BG
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Manifolds & Headers

Purpose and Function in the Exhaust System

The presented exhaust manifold is a component from the Exhaust Manifolds group, responsible for collecting exhaust gases from three cylinders of the M112 engine on the left side and directing them further to subsequent sections of the system. By maintaining the factory shape of the channels and mounting points, the manifold enables:

• maintaining proper exhaust gas flow in the gasoline engine,
• preserving stock torque and power parameters,
• compatibility with original heat shields and further exhaust sections.

Its placement on the left side of the power unit allows for direct replacement of a damaged component without interfering with the structure of other parts.

Compatibility with M112 Engine and Mercedes Vehicles

The Exhaust Manifold 4-6 for M112 Engine is designed for gasoline units used in Mercedes E-Class W210 and S-Class W220 models. Appropriate bolt spacing, outlet angle to the rest of the system, and fit to the engine head make this component the right choice for:

• replacing a worn or cracked manifold,
• restoring the factory exhaust system configuration after modifications,
• servicing vehicles where maintaining the original technical specification is crucial.

By adhering to manufacturer standards, installation is predictable, without the need for modifications to mounts or flanges.

Characteristics of a Used Part

The offered manifold is a used part, which means it comes from a dismantled vehicle and has been verified for its suitability for further use. This type of component is particularly attractive to users who:

• are looking for original solutions within a reasonable budget,
• want to avoid problems with fitting aftermarket alternatives of uncertain geometry,
• prioritize maintaining the factory performance characteristics of a gasoline engine.

The original manifold design promotes stable power unit operation, reduces the risk of leaks, and facilitates future servicing, as the mechanic is dealing with a well-known, stock solution.

Benefits of Using an Original Exhaust Manifold

Using this manifold in a Mercedes with an M112 engine offers a range of practical operational benefits:

• maintaining proper exhaust gas removal from cylinders 4–6,
• reducing the risk of leaks at the junction with the cylinder head and the rest of the system,
• maintaining the correct operation of lambda sensors and emission control systems,
• easier diagnosis of potential exhaust system faults in the future.

For workshops and private users, this means more predictable installation and a lower risk of problems related to improper part fitment.

If you are planning a comprehensive repair or engine area upgrade for your Mercedes and need other parts from the same group, such as manifolds for other cylinder banks, connecting pipes, or mounting elements, check the available parts in the Mercedes Exhaust Manifolds category.

More About Exhaust Systems and Used Parts

If you want to better understand how the selection of a used manifold affects the performance, running culture, and durability of the exhaust system in premium cars, it is worth consulting specialized materials. Practical tips on choosing used manifolds and other exhaust system components can be found in the article Performance Exhaust System: Used Manifolds and Sport Catalytic Converters on the Road, which discusses, among others, vehicles from brands such as Mercedes, BMW, Audi, VW, and Mini.