F8X F80 M3 F82 F83 M4 Gloss Black Diffuser (2015-2020)

Upgrade the rear-end appearance of your 2015-2020 BMW F80 M3, F82 M4, or F83 M4 Convertible with this Gloss Black Rear Diffuser. Designed for the F8X M platform, this diffuser adds a clean, aggressive, and performance-inspired detail to the factory rear bumper.

The gloss black finish gives the rear bumper a sleek and refined look while complementing the factory BMW body lines. Its diffuser-style design helps create a more defined rear profile, making it a strong visual upgrade for street, show, and enthusiast builds.

Constructed with a gloss black exterior finish, this rear diffuser is a practical styling upgrade for drivers who want a bold rear-end accent without a carbon fiber appearance. Professional installation is recommended to ensure proper test fitting, alignment, and secure mounting before road use.

Product Specifications

Key Features

• Designed for BMW F80 M3, F82 M4, and F83 M4 Convertible models
• Gloss black rear diffuser design
• Adds a cleaner and more aggressive rear-end appearance
• Enhances the lower rear bumper profile
• Complements the factory F8X body lines
• Sleek gloss black finish for a refined exterior accent
• Performance-inspired styling for street, show, and enthusiast builds

Configuration Options

• Gloss black rear diffuser for BMW F8X M3/M4

Package Includes

• 1 gloss black rear diffuser

Note: Professional installation is recommended to ensure proper test fitting, rear bumper alignment, and secure mounting before road use.

Installation

• Test fit the rear diffuser before final installation
• Clean and prepare the rear bumper mounting area
• Position the diffuser evenly along the lower rear bumper
• Secure using appropriate mounting hardware or adhesive as required
• Check alignment and all mounting points before road use
• Professional installation is recommended for best results

Fitment

• 2015-2018 BMW F80 M3
• 2015-2020 BMW F82 M4 Coupe
• 2015-2020 BMW F83 M4 Convertible

United States: Free shipping available to the lower 48 states across all items. Other states will incur a shipping charge.

Worldwide: Free shipping is available for Complete Headlights, Taillights, DRLs. For custom headlight retrofits, carbon fiber products, and performance products, there will be a shipping charge.  

Please note:
• For Retrofits, you are purchasing a headlight modification service.
• If you select "Shipping own headlights to BayOptiks for modification", you are required to send us your headlights.
• If you choose "Purchase new OEM headlights", we will order and modify a new OEM headlight for you.
• Once your customizations are complete, we will ship it to you!

• Complete Headlights: 3-5 business days for order processing plus shipping time.
• Custom & Pre-Built Headlights: 6-8 weeks depending on the complexity and component availability.
• New OEM and cores: 6-8 weeks plus an additional 4-8 weeks as these are special orders base on the vehicle VIN due to different versions (North American, European, etc.)
• DRLs, Taillights, Brake Pads, and Carbon Fiber Aero: 3-5 business days for order processing, plus shipping time.
• Lens Replacements: 1-3 weeks plus shipping time.

Please note, we do not have control over the time frames of our vendors, manufacturers, and delivery services as they may delay processes in regards to components and shipment.