BMW E90 E91 Rear Bumper Diffuser M Sport Bottom Trim Panel Insert 8043239

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E90 E91 Rear Bumper Diffuser M Sport Bottom Trim Panel Insert is an original body component from the Bumper inserts and covers category, designed for installation in the rear section of the vehicle. Designed as part of the M package, it ensures a consistent look with the factory BMW styling and improves protection for the lower bumper area. This is a solution for users who expect precise fitment and the preservation of the factory body lines.

Specifications and technical data

• SKU: 8043239-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8043239
• Substitutable numbers: 51128043239, 8043239, 51128044637, 8044637
• Location on the vehicle: Rear
• Part type: Bumper Insert
• Category: Bumper Inserts & Covers

Purpose and function of the component

The presented rear bumper insert is dedicated to BMW 3 Series E90/E91 models equipped with the M package, where it serves as a lower cover and diffuser. Positioned at the rear of the vehicle, it helps to streamline airflow under the car and protects critical parts of the bumper from operational damage. Thanks to a design consistent with factory BMW standards, the component works in harmony with the bumper line, maintaining proper fitment and stable mounting.

Construction and fitment for BMW

As part of the original BMW body system, the insert has been designed for precise installation in the rear bumper zone. The shape, mounting points, and edge geometry are adapted to the factory M Sport bumper, which facilitates installation and limits the need for additional modifications. The applied design supports the maintenance of proper rigidity in the lower part of the bumper, while not interfering with the operation of other body components or the exhaust system.

Performance characteristics and advantages

The M Sport rear bumper bottom cover combines a protective function with an aesthetic finish for the rear of the body. The component helps reduce the risk of mechanical damage in the lower bumper area, which is particularly important during daily city driving and parking. At the same time, it maintains the characteristic, sporty look of the M package, allowing for visual consistency across the entire vehicle. Choosing an original cover from this group is a way to maintain proper body geometry and compliance with factory aerodynamic solutions.

Condition, origin, and service application

The component comes from disassembly and is offered as a used part, which allows for an economical repair of the rear bumper while maintaining the original BMW specification. This type of component is particularly useful for post-accident repairs when it is necessary to replace a damaged bottom cover without interfering with other bumper elements. Thanks to the preservation of the factory design, installation is based on existing mounting points, which facilitates workshop work and shortens service time.

Repair expansion and selection of body components

If you are planning a comprehensive repair or upgrade of the rear bumper zone in your BMW and need other elements from the same group, such as additional covers, inserts, or bottom panels, check out the available parts in the BMW Bumper inserts and covers category.

For more extensive body and paint work, as well as when selecting used body components, it is worth familiarizing yourself with practical tips regarding post-accident repairs – you will find them in the article Bodywork and chassis – post-accident repairs using dismantled parts, which discusses the selection of OEM components, assembly procedures, and typical problems encountered in service.