BMW E90 E91 M Sport Rear Bumper Lower Centre Diffuser Trim Cover Panel 7906504

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E90 E91 M Sport Rear Bumper Lower Centre Diffuser Trim Cover Panel is an original lower center rear bumper diffuser trim designed for BMW 3 Series E90 and E91 models with the M Sport package. This component belongs to the Bumpers and reinforcements group and serves as a precisely fitted cover for the central part of the rear bumper, enhancing both the appearance and functionality of the vehicle's rear section.

Specifications and technical data

• SKU: 7906504-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7906504
• Substitutable numbers: 51127906504, 7906504
• Location on the vehicle: Rear
• Category: Bumpers & Reinforcements

Purpose and function of the component

The presented diffuser trim is designed for installation in the rear of the body, in the lower, central zone of the M Sport bumper. Its purpose is to provide an aesthetic finish to the lower edge of the bumper and to streamline airflow at the rear of the vehicle. Thanks to its factory geometry, the component ensures:

• a visually cohesive connection with other bumper components,
• stable mounting at the original attachment points,
• preservation of the characteristic sporty line of the M Sport package.

Construction and fitment for BMW E90 / E91 M Sport

The lower center diffuser cover was developed by BMW as part of the rear bumper aerodynamic system. The construction of the component complies with the manufacturer's factory standards, which translates into:

• precise fitment with the original M Sport bumper,
• compatibility with standard mounts and clips,
• maintenance of the correct parting line between the diffuser and the rest of the bumper.

As a result, installation is straightforward, without the need for modifications or reshaping, and the entire rear bodywork regains its factory, sporty look.

Performance characteristics and benefits of installation

As an element from the Bumpers and reinforcements group, this diffuser trim contributes to the completeness of the rear bumper and the protection of its lower section. Replacing a damaged or missing panel with an original component allows you to:

• restore the cohesive look of the rear bodywork after a collision or modifications,
• maintain proper airflow under the vehicle,
• preserve the characteristic sporty nature of the M Sport version.

The used condition of the part makes it a cost-effective solution while maintaining the factory design and compatibility with the BMW 3 Series E90/E91 body.

Installation zone – rear of the vehicle

The component is intended for installation at the rear of the vehicle, in the central zone of the lower bumper edge. This placement ensures that the panel serves both a visual and partially protective function for the lower part of the bumper. A correctly installed diffuser:

• closes the lower bumper contour, eliminating unsightly gaps,
• creates a uniform line with other M Sport package elements,
• emphasizes the sporty character of the rear bodywork.

Complementary elements and rear section expansion

If you are planning a comprehensive repair or upgrade of the rear bumper area in your BMW and need other components from the same group, such as additional panels, reinforcements, or covers, check out the available parts in the BMW Bumpers and reinforcements category.

For users interested in further improving the vehicle's characteristics – especially in terms of sporty appearance and sound – materials regarding the exhaust system and performance components may also be helpful, available in the article Performance exhaust system: used manifolds and sports catalytic converters on the road, which discusses practical aspects of selecting used components for BMW and other brands.