Flue Gas Collector Mercedes W164 W203 W211 OM642 Diesel Exhaust Pipe A6421420309

Flue Gas Collector Mercedes W164 W203 W211 OM642 Diesel Exhaust Pipe is a specialized exhaust system component designed for diesel engines, ensuring proper exhaust gas discharge from the cylinders to the turbocharger. Thanks to the precise geometry of the channels and its perfect fit for the OM642 unit, the collector supports stable turbocharger operation, correct boost characteristics, and uniform thermal load. This is a solution for users expecting an efficient, technically matched component for their Mercedes.

Specifications and technical data

• SKU: A6421420309
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421420309
• Substitutable numbers: A6421420309, A 642 142 03 09, BG
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Manifolds & Headers

Purpose and function in the exhaust system

The turbo exhaust manifold in a diesel engine is responsible for collecting exhaust gases from individual cylinders and directing them to the turbine rotor. A properly selected component allows for maintaining the correct exhaust pressure and temperature, which translates into stable boost, predictable throttle response, and reduced energy losses. In OM642 units, this is of particular importance due to the torque characteristics and thermal load.

Construction and placement on the vehicle

The presented collector belongs to the Exhaust manifolds group and is mounted in the front part of the engine compartment, in the immediate vicinity of the turbocharger. This placement shortens the exhaust gas flow path, which promotes faster turbo spooling and reduces pressure drops. The design is adapted to the specifics of the diesel unit, taking into account the higher thermal loads typical for compression-ignition engines.

Benefits of use in the OM642 diesel engine

Using the correct turbo exhaust manifold in the OM642 engine brings a number of practical operational benefits:

• maintaining proper exhaust gas flow towards the turbocharger,
• reducing the risk of leaks in the critical area of the exhaust system,
• stable turbocharger operating conditions under typical diesel loads,
• better repeatability of engine performance parameters across the entire rev range.

For the user, this means more predictable vehicle behavior, correct cooperation with the turbocharging system, and the possibility of further engine diagnostics without interference resulting from a damaged collector.

Application in Mercedes vehicles

The element was designed for Mercedes diesel units that utilize the OM642 engine. This ensures that the correct mounting points, connection geometry, and compatibility with the factory-specified turbocharger for this unit are maintained. This is particularly important during repairs where the goal is to maintain the original operating characteristics of the powertrain without interfering with the exhaust system design.

Condition and service application

The product comes from a group of used components, which allows for economical repair while maintaining an appropriate level of technical fit. This type of collector will work well both for standard replacement of a damaged element and for broader service work involving the turbocharger, exhaust system, and diesel engine accessories.

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 collectors, connection sections, or mounting elements, check the available parts in the Mercedes exhaust manifolds category.

For drivers who want to better understand the impact of the collector and turbocharger on performance and exhaust system characteristics, we have prepared a practical guide – more information can be found in the article Performance exhaust system: used manifolds and sports catalytic converters on the road.

If you are interested in a broader context of the OM642 unit's operation, its typical faults, and the impact of accessories on performance, it is also worth reading the material The second life of the Mercedes OM642 engine – how injectors and a turbocharger restore the power of the 3.0 V6 CDI, which will help you plan comprehensive service actions around the turbocharging and exhaust system.