BMW 3 Series E46 N42 N46 316i 318i Exhaust System Manifold Petrol 7510250

BMW 3 Series E46 N42 N46 316i 318i Exhaust System Manifold is an original exhaust system component for petrol engines, designed specifically for this generation of the 3 Series. Thanks to its factory geometry and fitment, it ensures proper exhaust gas discharge, stable engine operation, and the maintenance of factory performance parameters. It is a practical solution for users who want to restore the correct operation of the exhaust system without experimenting with aftermarket replacements.

Specifications and technical data

• SKU: rhd-7510250
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7510250
• Substitutable numbers: 11627510250 7510250, EM
• Fuel type: Petrol
• Category: Other Engine Parts

Purpose and compatibility

The presented exhaust manifold is intended for BMW 3 Series E46 models with N42 and N46 petrol engines in 316i and 318i versions. The design of the component is adapted to the characteristics of these units, which allows for maintaining the correct backpressure in the exhaust system, proper operation of the lambda sensors, and even exhaust gas discharge from individual cylinders.

The original origin of the part means that the factory mounting points for the cylinder head, heat shields, and subsequent sections of the exhaust system are preserved. This facilitates installation and reduces the risk of leaks resulting from imprecise fitment.

Construction and function in the exhaust system

The exhaust manifold in N42/N46 engines plays a key role in the first phase of discharging exhaust gases from the combustion chamber. Properly shaped channels collect exhaust gases from the cylinders and direct them to the rest of the system, which affects:

• stable engine operation at idle,
• proper throttle response across the entire rev range,
• maintenance of correct exhaust emission parameters,
• protection of sensitive components, such as lambda sensors and the catalytic converter.

By maintaining the original geometry, the manifold supports the factory torque and power characteristics, which is important both in daily operation and during engine diagnostics.

Condition, verification, and installation recommendations

The part comes from disassembly and is offered as a used original component, which in practice means a favorable compromise between cost and vehicle fitment. Before installation, a standard inspection of the mating surfaces, threads, and mounting points is recommended, as well as the use of new gaskets and fasteners in accordance with the BMW service procedure.

During installation, it is worth paying attention to:

• correct positioning of the manifold relative to the cylinder head and the rest of the system,
• tightening torque of the bolts in accordance with service documentation,
• tightness of connections after the engine has warmed up for the first time,
• absence of stress on flexible joints and heat shields.

Benefits of using an original BMW manifold

Using an original exhaust manifold in a BMW E46 with a petrol engine helps limit typical problems associated with mismatched replacements, such as leaks, incorrect lambda sensor readings, or unwanted vibrations. This is a particularly beneficial solution for users who want to maintain the consistency of the powertrain and avoid additional modifications.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as intake manifolds, heat shields, or exhaust system mounts, check the available parts in the Other BMW category.

Technical knowledge and powertrain development

For a comparison of the characteristics of various design solutions in sports versions of cars, including the influence of the exhaust system on performance and durability, it is worth reading an article describing the differences between stock and more powerful variants of models from the VAG group. A detailed discussion can be found in the material Audi RS vs other models – what is hidden under the hood and chassis?, which allows for a better understanding of the relationships between engine design, exhaust, and accessories.