BMW Avant Line Rear Bumper Diffuser 8K0807521D1RR

( Brand: Bmw ), ( Manufacturer Part Number: 8K0807521D ), ( Type: Line ), ( Import Taxes: No Duties To Usa Customers ), ( Reference Oe/oem Number: 8k0-807-521-d-1rr ), ( Placement On Vehicle: Rear )

Review BMW Audi Avant S line Rear Bumper Diffuser Oem fits A4 B8 2009–2012

Introducing the BMW and Audi S-Line Rear Bumper Diffuser for select BMW 5 Series and Audi A4 Avant models from 2009 to 2012, specifically for BMW 525i, 530i, 535i, 550i, and M5 models, as well as Audi A4 Avant 1.8T, 2.0T, and 3.2 FSI versions. This high-performance rear bumper diffuser is an ideal addition for those seeking to enhance the aesthetic appeal and functionality of their vehicles.

Manufactured with premium quality materials, this diffuser boasts a sleek and modern design that complements the overall look of both BMW and Audi S-Line models. The exterior is crafted from durable ABS plastic, ensuring resistance to extreme weather conditions, road debris, and everyday wear and tear. The matte black finish not only provides an elegant appearance but also effectively conceals any dirt or grime, maintaining a clean and sophisticated look for extended periods.

The primary function of the BMW and Audi S-Line Rear Bumper Diffuser is to improve the aerodynamic performance of your vehicle. By smoothing the airflow at the rear bumper, it reduces drag and turbulence, contributing to improved fuel efficiency and reduced exhaust emissions. Additionally, it helps to maintain vehicle stability at high speeds by preventing any unwanted lift at the rear end.

Installation of the diffuser is a straightforward process, thanks to its plug-and-play design. It is designed to fit seamlessly onto the OEM bumper without requiring any modifications. The diffuser comes equipped with all necessary mounting hardware, allowing for a hassle-free installation experience.

This rear bumper diffuser not only delivers impressive performance benefits but also adds a touch of style and exclusivity to your BMW or Audi S-Line model. It is the perfect accessory for those who demand both performance and aesthetics from their vehicles. Upgrade your ride today with the BMW and Audi S-Line Rear Bumper Diffuser.

The BMW 8K0807521D and Audi A4 Avant B8 S-line rear bumper diffusers are aftermarket parts designed to enhance the aesthetics of these vehicles. Both are high-quality components, but there are some differences between them that may influence your buying decision.

1. OEM (Original Equipment Manufacturer) part: This means it is an exact replacement for the original BMW bumper diffuser.

2. Perfect fit: Since it is an OEM part, it ensures a precise fit to the BMW vehicle.

3. High-quality materials: BMW uses premium materials for its parts, ensuring durability and longevity.

1. Cost: Being an OEM part, it may be more expensive compared to aftermarket alternatives.

2. Limited availability: OEM parts may not be as easily available as aftermarket parts, especially from dealerships.

1. Aftermarket part: This means it is a non-original replacement for the Audi bumper diffuser.

2. Variety: Aftermarket parts often come in different styles and finishes, allowing for more customization options.

3. Cost-effective: Aftermarket parts are generally more affordable than OEM parts.

1. Fitment: While aftermarket parts generally fit well, they may not be an exact match to the OEM part.

2. Quality concerns: Aftermarket parts may not be of the same quality as OEM parts, and some may be prone to wear and tear more quickly.

Both the BMW 8K0807521D and Audi A4 Avant B8 S-line rear bumper diffusers serve the same purpose but are different in terms of being OEM or aftermarket parts. If you prioritize a perfect fit and high-quality materials, the BMW OEM part may be the best choice for you, despite the higher cost. However, if you are looking for more customization options and want to save some money, the aftermarket Audi part could be a suitable alternative.

To make an informed decision, consider your budget, preference for customization, and the importance of a perfect fit. If you value an exact fit and high-quality materials, choose the BMW OEM part. If you're seeking more affordable options and are willing to accept some trade-offs in terms of fit and finish, go for the aftermarket Audi part.

Details:

Used Audi B8 2009 2012 A4 wagons line rear diffuser oem.

part #: 8k0807521d prices

• $184.06-$300.00

specifications airintakesystemse:

• for models: A4, B8
• for makes: Audi, Bmw
• for years: 2009-2012
• brand: Bmw
• mpn: 8k0807521d
• type: Line
• import taxes: No Duties To Usa Customers
• reference oe/oem number: 8k0-807-521-d-1rr
• placement on vehicle: Rear

payments airintakesystemse:

• money order
• credit card: Diners-club
• other
• wallet: Apple-pay

seller airintakesystemse:

• city: East Syracuse, New York
• rating: 99.4%
• # reviews: 2122

offer airintakesystemse:

• options: Ship-to-home
• quantity: 1
• sold: 0
• started: September 17, 2025
• availability: In Stock

shipping airintakesystemse:

• transit: 5-10 Days
• cost: $40.00
• class: Expedited
• carrier: USPS
• type: Fixed
• service: USPS Priority Mail

general airintakesystemse:

• condition: Used
• Car Truck Parts Accessories > Air Fuel Delivery > Hoses, Lines Pipes

returns airintakesystemse:

• policy: No Returns

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