BMW 3 Series E90 E91 E92 E93 LCi 325i N52N Exhaust Manifold Catalytic Converter

BMW 3 Series E90 E91 E92 E93 LCi 325i N52N Exhaust Manifold Catalytic Converter is an original exhaust system component, specifically designed for the N52N engine in facelifted 3 Series models. Thanks to its factory-spec geometry and fitment, it ensures proper exhaust gas flow, stable engine operation, and compliance with factory emission parameters. This is the ideal solution for users who want to maintain the original characteristics of the exhaust system without compromising on quality.

Specifications and technical data

• SKU: 7563734
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 18407563734
• Substitutable numbers: 7550559, 18407563734, 7563734
• Category: Manifolds & Headers

Purpose and compatibility

The presented exhaust manifold integrated with a catalytic converter is dedicated to the N52N petrol engine in BMW 3 Series E90, E91, E92, and E93 facelift (LCi) models in the 325i version. The design was developed by the vehicle manufacturer, which translates into a perfect fit for the cylinder head, correct positioning of lambda sensors, and compatibility with the factory-standard downstream exhaust section.

Construction and function in the exhaust system

The component serves a dual role: it acts as a manifold collecting exhaust gases from individual cylinders and as a housing for the catalytic converter responsible for reducing harmful exhaust emissions. The applied channel geometry supports even cylinder scavenging, which helps maintain stable operation of the N52N unit across the entire rev range. The properly selected capacity and shape of the catalytic section help preserve factory performance and engine refinement.

Thanks to its original design, the manifold works with the stock engine control unit without the need for software modifications. This is particularly important for daily-driven vehicles, where operational predictability, the absence of diagnostic system errors, and compliance with technical inspection requirements are essential.

Benefits of using an original exhaust manifold

Using a factory exhaust manifold with a catalytic converter in a BMW 325i N52N offers a number of practical advantages:

• reliable fitment to the cylinder head and other exhaust system components,
• preservation of stock torque and power characteristics,
• proper cooperation with lambda sensors and the OBD diagnostic system,
• reduced risk of leaks and unwanted resonances,
• maintenance of compliance with factory exhaust emission standards.

For the user, this means stable, predictable operation and no need for additional mechanical or electronic modifications. Choosing an original component from the Exhaust Manifolds category is particularly beneficial for cars where durability and maintaining the stock driving character are the priorities.

Product characteristics and condition

The offered BMW exhaust manifold comes from dismantling and is a used part, which provides a reasonable compromise between cost and maintaining original build quality. This type of solution is often chosen for repairs where fitting a specific engine version and maintaining factory specifications is crucial. Using an OEM component allows you to avoid problems typical of cheap replacements, such as inaccurate fitment or accelerated wear.

Thanks to the original design, the manifold can be installed in place of a worn or damaged part without interfering with mounting points, exhaust routing, or sensor placement. This translates into more efficient installation at a specialized service center and reduced vehicle downtime.

Exhaust system expansion and additional information

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other components from the same group, such as manifolds, downpipes, or other parts of the exhaust system, check out the available parts in the BMW Exhaust Manifolds category.

For drivers interested in the impact of the manifold and catalytic converter on performance and engine characteristics, we have prepared a guide. You can find more about selecting used exhaust system components and how to consciously choose manifolds and catalytic converters for cars like BMW in the article Performance exhaust systems: used manifolds and sports catalytic converters on the road.

If you want to better plan a larger scope of service work and learn how to effectively source original used components in one place, the guide Comprehensive sourcing: From the engine to the smallest clip – how to collect used car parts in one place? may also be helpful.