BMW 5 7 Series E38 E39 Petrol Air Intake Box Duct Rubber Boot Pipe 1740931

BMW 5 7 Series E38 E39 Petrol Air Intake Box Duct Rubber Boot Pipe is an original engine intake system component responsible for a tight and stable connection between the filter housing and the rest of the intake tract. Thanks to its factory geometry and flexible design, it ensures proper airflow, which translates into stable engine operation and predictable throttle response.

Specifications and technical data

• SKU: 1740931
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1740931
• Substitutable numbers: 13541740931, 1740931, AS
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the intake system

The rubber air intake pipe for the BMW 5 and 7 Series E38/E39 generation was designed specifically for petrol engines. Its task is to guide air from the filter housing to the subsequent components of the intake system while maintaining proper tightness and resistance to vibrations and temperature changes.

Precisely formed ports and a bellows section allow for the compensation of engine movements relative to the body, reducing the risk of cracks and leaks. As a result, the intake system maintains stable parameters, which promotes smooth engine operation, correct fuel dosage, and a reduction in unwanted air turbulence.

Construction and material properties

The element is made of flexible rubber material adapted for operation in the engine compartment, where elevated temperatures, moisture, and contact with oil vapors occur. The structure of the pipe combines:

• smooth sections, ensuring stable mounting on the filter housing ports and other intake components,
• bellows sections, enabling the compensation of vibrations and minor displacements of the powertrain,
• an internal profile optimized for the freest possible airflow.

This solution helps reduce stress in the system, decreases the risk of leaks, and supports the maintenance of stable fuel-air mixture parameters. This is particularly important in petrol engines, where the quality of the intake has a direct impact on engine refinement and fuel consumption.

Benefits of using an original BMW pipe

Using an original air intake pipe in the BMW 5 and 7 Series E38/E39 provides a number of practical operational benefits:

• Factory fitment – the correct length, diameters, and cross-sectional shape minimize the risk of installation stress and leaks.
• Stable petrol engine performance – proper airflow promotes smooth operation at idle and under load.
• Reduction of unwanted "false air" intake – a tight pipe reduces the risk of engine control unit adaptation errors and idle fluctuations.
• Hassle-free installation – the design is compatible with factory mounting points and clamps, facilitating replacement in workshop conditions.

Condition, installation, and service application

The offered item comes from the Lines, Hoses, and Pipes group and is intended for use as a replacement part in the intake system of BMW 5 and 7 Series E38/E39 petrol engines. As a used component, the pipe is an economical service solution, allowing for the restoration of proper intake tightness in situations where the existing part has cracked, perished, or deformed.

Replacing the pipe is a typical maintenance operation performed when diagnosing problems with rough engine operation, power loss, or the appearance of errors related to the fuel-air mixture. A correctly selected and installed pipe helps eliminate these symptoms without the need to interfere with more expensive components.

Related components and additional technical information

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other elements from the same group, such as additional intake pipes, flexible hoses, or breather tubes, check the available parts in the BMW Lines, Hoses, and Pipes category.

For users interested in a broader technical context of BMW power units and selecting parts from the secondary market, an article comparing the brand's popular diesel engines may be helpful – you can find a detailed comparison in the material BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels, which discusses aspects such as reliability and the availability of replacement components.