BMW 3 Series E90 E92 E93 M3 Exhaust Left N/S Manifold Cat Converter

BMW 3 Series E90 E92 E93 M3 Exhaust Left N/S Manifold Cat Converter is an original exhaust system component designed for installation on the left side of the sporty M3 version. Engineered by BMW as part of the factory system, it ensures proper exhaust gas routing and seamless cooperation with the powertrain under dynamic driving conditions. This used component allows for a technically correct repair of the exhaust system without the need for aftermarket alternatives with uncertain specifications.

Specifications and technical data

• SKU: 7840792
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7840792
• Substitutable numbers: 7840792, M3, Exhaust, Catalytic, Converter
• Location on the vehicle: Left
• Category: Other Exhaust & Systems

Purpose and function in the exhaust system

This exhaust manifold integrated with a catalytic converter has been developed specifically for the M3 version of the 3 Series E90, E92, and E93, where the exhaust system operates under significant thermal and mechanical stress. The component is responsible for:

• collecting exhaust gases from the cylinders on the left side of the engine and ensuring their uniform discharge,
• working with the catalytic converter to reduce emissions,
• maintaining proper exhaust flow, which affects power and torque characteristics.

Thanks to the factory geometry of the manifold, the correct flow dynamics are maintained, which is particularly important in the high-revving M3 engine.

Construction and mounting fitment

The manifold with a catalytic converter has been constructed as a component dedicated to the specific configuration of the M3 engine in E90, E92, and E93 body styles. This means:

• precise fitment to the cylinder head on the left side of the engine,
• compatibility with the factory routing of the rest of the exhaust system,
• retention of original mounting points and connections.

Such a solution facilitates installation and limits the risk of leaks that could occur when using components with different geometry. The original BMW design also helps maintain the proper noise level and acoustic comfort inside the vehicle.

Benefits of using an original M3 manifold

Using a factory exhaust manifold with a catalytic converter in an M3 provides a range of practical technical benefits:

• maintaining stock engine performance parameters and power delivery characteristics,
• compatibility with the factory engine control unit (ECU) software,
• adherence to the exhaust emission values specified by the manufacturer,
• no need for adaptation or modifications to the exhaust system.

A used OEM component is a sensible solution for repairs where both technical correctness and cost control are important, especially in cars driven dynamically.

Condition, verification, and service application

The offered exhaust manifold with a catalytic converter is a pre-owned component, which allows for an economical repair of the exhaust system while maintaining the original BMW specification. Before installation, it is recommended to perform a standard check of connection tightness, the condition of mating surfaces, and mounting hardware to ensure proper operation of the system on the left side.

In workshops specializing in M3 E90/E92/E93 models, such a component is often used for:

• repairs following mechanical damage to the exhaust system,
• fixing leaks in the manifold area,
• restoring the stock configuration after previous modifications.

Related categories and technical materials

If you are planning a comprehensive repair or upgrade of the engine and exhaust area in your BMW and need other components from the same group, such as manifolds, catalytic converters, or pipe sections, check out the available parts in the Other BMW category.

For a comparison of sports powertrain characteristics and differences in the construction of high-performance units, you can refer to our guide Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, the impact of the exhaust system and engine accessories on vehicle performance.