Muffler Silencer BMW Z4 E89 Exhaust Back Box Double Twin Pipe 7613663

Muffler Silencer BMW Z4 E89 Exhaust Back Box Double Twin Pipe is an original exhaust system component from the Mufflers and resonators group, designed for installation in the BMW Z4 E89 model. It ensures proper exhaust noise reduction while maintaining the characteristic BMW sound and correct operation of the exhaust system under road conditions.

Specifications and technical data

• SKU: 7647052
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7647052
• Substitutable numbers: 18307647052, 7647052, 18307613661, 7613661, 7613663, BG
• Weight: 150
• Category: Mufflers & Resonators

Technical characteristics and purpose

The presented rear muffler with a double twin tailpipe has been designed specifically for the BMW Z4 E89 generation. The back box construction is responsible for the final stage of noise suppression, exhaust flow stabilization, and maintaining the appropriate backpressure in the exhaust system.

The component comes from the BMW OE line, which means factory-perfect fitment to the body geometry, stock hangers, and exhaust routing. As a result, installation is predictable, with no need for modifications or adjustments to pipe diameters.

Construction and function in the exhaust system

The muffler performs several key functions in a sports roadster like the BMW Z4 E89:

• reduction of exhaust noise to a level compliant with vehicle type approval,
• shaping the sound characteristics typical of BMW,
• cooperation with other components from the Mufflers and resonators group,
• stabilization of exhaust flow under various engine loads.

The double twin exhaust tip emphasizes the sporty character of the Z4 E89 model while maintaining the stock appearance of the rear of the vehicle. The properly selected mass of the component promotes effective vibration damping and limits the transmission of resonance to the chassis.

Benefits of using an original BMW muffler

Using an original rear muffler in the BMW Z4 E89 allows for maintaining the consistency of the entire exhaust system according to the manufacturer's specifications. The most important advantages include:

• factory fitment to brackets, hangers, and other exhaust sections,
• stable acoustic parameters and absence of excessive vibrations,
• preservation of the stock look of the rear bumper and tailpipe cutouts,
• compatibility with factory heat shields and other system components.

This solution is particularly beneficial for post-accident repairs, replacing a worn-out muffler, or restoring the car to a factory-like state after exhaust modifications.

Condition, origin, and service application

The offered component is used, which makes it a reasonable choice for cost-effective exhaust system repair, especially in daily-driven vehicles. The muffler comes from dismantling, thanks to which it retains its original geometry and factory mounting points.

It works well both as a replacement for a worn or corroded muffler and when restoring a stock system after previous modifications. A properly selected rear component helps reduce unwanted vibrations, excessive noise, and potential leaks in the rear part of the exhaust.

Compatibility within the parts group

The muffler belongs to the Mufflers and resonators group, which often includes various versions in terms of construction and purpose. In this segment, factors such as compatibility with a specific body version, engine type, and exhaust routing are important. Before installation, it is worth verifying the compatibility of the part with your specific BMW Z4 E89 model using the OEM number and interchangeable numbers available in the technical specification.

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

Additional technical support and BMW knowledge

BMW owners often combine exhaust system work with electronics and comfort system maintenance. If you are interested in how to effectively use parts from dismantling in other areas of the vehicle, it is worth consulting specialized materials. Practical tips on working with modules and onboard systems can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using parts from dismantling?.