M3 and M4 BMW Model Diffuser Carbon Fiber Cover 2021-2024

Upgrade the rear-end appearance of your 2021-2024 BMW G80 M3, G82 M4, or G83 M4 Convertible with this Carbon Fiber Rear Diffuser Cover. Designed for the G8X M platform, this cover adds a premium carbon fiber accent while allowing you to retain the factory OEM diffuser.

This diffuser cover is ideal for owners who want a cleaner, sharper, and more aggressive rear-end appearance without replacing the entire diffuser assembly. Its carbon fiber finish enhances the lower rear bumper area while complementing the bold factory styling of the M3 and M4.

Constructed from carbon fiber, this rear diffuser cover offers a practical exterior upgrade for street, show, and enthusiast builds. Professional installation is recommended to ensure proper test fitting, alignment, and secure placement before road use.

Product Specifications

Key Features

• Designed for 2021-2024 BMW G80 M3, G82 M4, and G83 M4 models
• Carbon fiber rear diffuser cover design
• Allows the OEM diffuser to remain in place
• Adds a sharper and more aggressive rear-end appearance
• Enhances the lower rear bumper profile
• Carbon fiber construction with a premium exterior finish
• Ideal alternative to a complete rear diffuser replacement
• Clean styling upgrade for street, show, and enthusiast builds

Configuration Options

• Carbon fiber rear diffuser cover for BMW G80 M3 and G82/G83 M4

Package Includes

• 1 carbon fiber rear diffuser cover

Note: This is a diffuser cover designed to install over the OEM diffuser, not a complete replacement diffuser. Professional installation is recommended for proper alignment and secure fitment.

Installation

• Test fit the diffuser cover before final installation
• Clean and prepare the OEM rear diffuser surface
• Position the carbon fiber cover evenly over the factory diffuser
• Secure using the appropriate adhesive or mounting method required
• Check alignment, clearance, and fitment before road use
• Professional installation is recommended for best results

Fitment

• 2021-2024 BMW G80 M3
• 2021-2024 BMW G82 M4 Coupe
• 2021-2024 BMW G83 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.