BMW 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 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 sports BMW models with gasoline engines. Designed as part of the factory system, it ensures proper exhaust gas routing, appropriate sound characteristics, and stable engine operation. This is a solution for users who want to maintain the OEM design and predictable vehicle behavior after replacing an exhaust component.

Specifications and technical data

• SKU: 7854736-1
• 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 mounted in the rear part of the exhaust system, responsible for final noise suppression and proper exhaust gas discharge outside the vehicle body. The design is matched to the specifics of the gasoline engines used in the BMW M3 F80 and M4 F82/F83, which allows for maintaining the factory engine performance characteristics and compatibility with the stock engine management system.

This element is particularly important in high-power vehicles, where stable backpressure in the exhaust system affects refinement, throttle response, and the durability of other components. Using an original rear silencer reduces the risk of unwanted resonances and vibrations that may occur with aftermarket replacements.

Benefits of using an original rear silencer

Choosing an original element from the Silencers and resonators group for BMW M3/M4 vehicles provides a number of practical technical benefits:

• preservation of the factory sound characteristics, matched to the sporty yet practical nature of M models,
• proper fitment to stock mounts and exhaust system routing,
• compatibility with body geometry, which minimizes the risk of rubbing and incorrect pipe alignment,
• maintenance of predictable exhaust flow parameters, essential for stock engine tuning.

As a result, replacing a worn or damaged silencer with an original equivalent allows for restoring proper exhaust system operation without the need for additional modifications.

Technical characteristics and compatibility

The rear silencer has been designed to work with gasoline engines used in sports versions of the BMW 3 and 4 series F-generation. The design accounts for thermal loads typical of high-power units, as well as requirements for exhaust flow during dynamic driving. The element is adapted for installation in the rear of the vehicle, in place of the factory silencer, using stock mounting points.

Properly selected diameters and geometry of the exhaust pipes allow for maintaining a balance between noise suppression and flow freedom, which is important for both driving comfort and the durability of turbochargers and other powertrain components.

Condition, installation, and service application

The offered rear silencer is a used part, making it an attractive service solution for users looking for original components on a reasonable budget. In practice, this allows for a technically correct repair of the exhaust system without the need for non-factory alterations or custom-made mounts.

Due to its factory origin, installation is similar to plug&play – after matching it to the specific car configuration, it is possible to use stock brackets, hangers, and connections. This solution is particularly beneficial in the case of accident repairs, replacing corroded elements, or restoring a car to a factory-like state after previous exhaust modifications.

Expansion of the BMW exhaust system

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.

For drivers interested in optimizing operating costs and conscious parts selection, it is also worth checking out tips on economical vehicle repair – you will find practical advice in the article Economical operation of a Ford – where to look for the greatest savings in mechanical and body repairs, which shows how the approach to original components can affect long-term service costs.