BMW 3 5 Z3 Series E30 E34 E36 M40 M43 Engine Exhaust Manifold 1723892

BMW 3 5 Z3 Series E30 E34 E36 M40 M43 Engine Exhaust Manifold is an original BMW exhaust system component, designed for M40 and M43 engines in popular 3, 5, and Z3 series models. Thanks to its factory-spec port geometry, it ensures stable exhaust gas discharge from the cylinder head, which promotes smooth engine operation and proper integration with the rest of the exhaust system. This is a practical solution for users looking for a proven, used component with a design that meets BMW specifications.

Specifications and technical data

• SKU: 1723892
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1723892
• Substitutable numbers: 11621723892, 1723892, 11621716639, 1716639, 11621723895, 1723895, BG
• Category: Manifolds & Headers

Application and compatibility with M40/M43 engines

The presented exhaust manifold has been designed to work with M40 and M43 engines used in classic BMW 3 Series E30/E36, 5 Series E34, and Z3 models. The precisely selected shape of the ports and mounting points allows for secure seating on the cylinder head and proper connection to the rest of the exhaust system without the need for modifications or adaptations. For many service and restoration projects involving older BMWs, this is a functional base for restoring factory engine performance parameters.

Construction and operating characteristics of the exhaust manifold

The exhaust manifold in BMW inline engines plays a key role in discharging exhaust gases from each cylinder and routing them into the rest of the system. The design of this component has been developed to:

• ensure the most uniform exhaust flow possible from individual cylinders,
• maintain stable backpressure in the exhaust system,
• minimize thermal stress in the area where it connects to the cylinder head,
• maintain appropriate mechanical rigidity under variable loads.

As a result, the manifold helps maintain proper engine performance and supports optimal conditions for the lambda sensor and other exhaust system components. The Exhaust Manifolds category includes parts that directly affect exhaust flow, which is why selecting the right model for a specific engine is crucial for durability and performance.

Benefits of using an original BMW manifold

Using an original BMW exhaust manifold instead of a worn or leaking component provides measurable operational benefits. The most important include:

• Factory fitment – compatibility with stud spacing, exhaust port shapes, and the position of the connection to the rest of the system.
• Stable engine performance – proper exhaust discharge reduces the risk of power loss, rough idling, or excessive cylinder head heating.
• Trouble-free installation – the ability to use standard gaskets, hardware, and mounts, which simplifies service work.
• Consistency with the rest of the exhaust system – maintaining the factory geometry facilitates compatibility with the catalytic converter, mufflers, and other components.

In the case of older BMW models, where the exhaust system has often been in use for many years, replacing the manifold with an original used part that retains its geometry is a reasonable compromise between cost and durability.

Condition, verification, and use in service projects

The offered BMW exhaust manifold comes from the secondary market, which allows for economical exhaust system repair while maintaining the factory design. Such components are frequently used both in standard repairs and in restoration projects for classic BMWs, where preserving original technical solutions is important. Used condition means that the part may show signs of wear, but its structure remains functional and suitable for further use after proper installation and the application of new gaskets.

If you are planning a comprehensive repair or upgrade of your BMW's engine bay and need other components from the same group, such as additional manifolds, connecting sections, or mounting hardware, check out the available parts in the BMW Exhaust Manifolds category.

More about the exhaust system and used manifolds

For those planning broader modifications or refreshing the exhaust system in BMW cars, it is worth expanding your knowledge about the manifold's impact on performance, operating temperature, and engine durability. Practical tips on selecting used manifolds, evaluating them before installation, and connecting them with other system components can be found in the article Performance exhaust systems: used manifolds and sports catalytic converters on the road, which discusses, among other things, solutions used in BMWs.