BMW 3 4 F80 M3 F82 M4 Rear Exhaust Silencer Muffler Back Box Double Twin Pipe

Visual condition of the part

The product shows signs of use visible in the photos.

BMW 3 4 F80 M3 F82 M4 Rear Exhaust Silencer Muffler Back Box Double Twin Pipe is an original exhaust system component from the Silencers and resonators group, designed for installation in the rear section of BMW vehicles with petrol engines. This solution allows for maintaining proper exhaust flow parameters, the characteristic engine sound, and correct integration with other exhaust components.

Specifications and technical data

• SKU: 7854736
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7854736
• Substitutable numbers: 18307854736, 7854736, 18307854735, 7854735
• Location on the vehicle: Rear
• Fuel type: Petrol
• Category: Mufflers & Resonators

Purpose and function in the exhaust system

The presented rear silencer is the final element of the exhaust system, mounted in the rear area of the vehicle body. It is responsible for:

• controlling the noise level generated by the petrol engine,
• stabilizing exhaust flow under high load,
• maintaining appropriate backpressure in the system,
• working in harmony with other exhaust sections in BMW sports models.

Thanks to a design tailored to the specifics of M-series power units, the silencer supports the dynamic performance characteristics of the engine while maintaining an acceptable noise level for daily use.

Compatibility and fitment for BMW

This component has been designed with BMW M-family models in mind, which translates into precise fitment to factory mounting points and correct compatibility with original hangers and other sections of the system. Using a component from the same product line minimizes the risk of leaks, installation stress, and unwanted vibrations.

Its original BMW origin ensures the preservation of factory design specifications, including pipe geometry, flow diameters, and damping characteristics, which is important for both performance and the durability of other drivetrain components.

Technical and operational characteristics

As a component intended for petrol-powered vehicles, the silencer is adapted to higher exhaust temperatures and dynamic load changes typical of engines with sports characteristics. The construction is focused on:

• resistance to variable thermal conditions,
• stable sound damping across the full RPM range,
• maintaining adequate throughput for a high-power engine.

The used condition means that the part comes from dismantling and may show signs of wear, yet it remains functional for further use after proper installation and verification by a mechanic.

Practical application and benefits of installation

Using this rear silencer in a BMW M-series allows for restoring the proper operation of the exhaust system after damage or wear of the previous component. The main benefits include:

• maintaining the factory sound character of the power unit,
• reducing the risk of diagnostic errors related to incorrect exhaust flow,
• maintaining compatibility with other exhaust system components,
• the possibility of economical repair through the use of a used part.

For users planning modifications in the exhaust area, using an original rear silencer can serve as a reference point for further work on the system.

Expanding the BMW exhaust system and knowledge about used parts

If you are planning a comprehensive repair or upgrade of the exhaust system area in your BMW and need other elements from the same group, such as additional silencers, resonators, or pipe sections, check the available parts in the BMW silencers and resonators category.

When selecting used exhaust components, it is worth knowing the typical pitfalls associated with tuning and purchasing second-hand parts – you can find practical tips in the article Buying used car parts – the most common mistakes when choosing tuning parts, which helps to consciously plan modifications and avoid installation problems.