BMW G80 G82 M3 M4 CTM Style Carbon Fiber LED Rear Bumper Diffuser with Side Extensions 2021-2026

Upgrade the rear-end appearance of your 2021-2026 BMW G80 M3 Sedan or G82 M4 Coupe with this CTM Style Carbon Fiber LED Rear Bumper Diffuser Kit with Side Extensions. Designed to complement the original BMW M rear bumper, this three-piece exterior upgrade combines an aggressive center diffuser with matching left and right corner extensions for a motorsport-inspired appearance.

Constructed from real carbon fiber with a clear-coated finish, this rear diffuser kit features a distinctive sculpted profile and integrated vertical LED brake light. The center diffuser's pronounced lower fins create an aggressive appearance, while the matching rear bumper corner extensions provide a coordinated carbon fiber accent along the lower bumper edges.

Designed for compatible BMW G80 M3 and G82 M4 factory rear bumpers, the center diffuser replaces the original rear lower diffuser, while the corner extensions attach to the left and right bumper areas. The kit uses clips and screws, with mounting hardware included. The integrated LED brake light requires an appropriate electrical connection, and professional installation is recommended to ensure secure mounting, proper alignment, and correct lighting operation.

Product Specifications

Key Features

• Designed for compatible 2021-2026 BMW G80 M3 and G82 M4 models
• Aggressive CTM Style rear bumper diffuser design
• Real carbon fiber construction with a clear-coated finish
• Integrated vertical LED brake light bar
• Matching left and right carbon fiber rear bumper corner extensions
• Three-piece kit for coordinated rear-end styling
• Distinctive sculpted lower diffuser fins
• Center diffuser designed as a replacement for the original component
• Corner extensions add an aggressive lower bumper profile
• Clip-and-screw attachment method
• Mounting hardware included

Configuration Options

• BMW G80 M3: Compatible 2021-2026 Sedan models with the appropriate original rear bumper.
• BMW G82 M4: Compatible 2021-2026 Coupe models with the appropriate original rear bumper.
• Design: CTM Style rear diffuser with matching side extensions.
• Material: Carbon fiber.
• Finish: Clear-coated black carbon fiber.
• Lighting: Integrated vertical LED brake light requiring electrical installation.

Package Includes

• 1 x CTM Style Carbon Fiber Center Rear Bumper Diffuser with Integrated LED Brake Light
• 1 x Left Carbon Fiber Rear Bumper Corner Extension
• 1 x Right Carbon Fiber Rear Bumper Corner Extension
• Mounting hardware

Note: Designed for compatible 2021-2026 BMW G80 M3 Sedan and G82 M4 Coupe factory rear bumper configurations. The center diffuser replaces the original rear diffuser, while the side extensions attach to the corresponding rear bumper corners. Installation uses clips and screws, and the LED brake light requires an electrical connection. The exact LED wiring method, drilling requirements, and installation instructions are not specified. Verify the original rear bumper design, mounting points, factory electrical configuration, and applicable rear lighting requirements before ordering. Compatibility with G83 M4 Convertible models should be confirmed separately. Professional installation is strongly recommended. Test fitting is recommended before final installation.

Installation

• Confirm the vehicle is a compatible BMW G80 M3 or G82 M4 with the appropriate factory rear bumper.
• Inspect the original center rear diffuser, rear bumper corners, and mounting points.
• Remove the original rear diffuser following the vehicle's applicable service procedure.
• Test fit the carbon fiber replacement diffuser against the original bumper openings.
• Align the center diffuser with the factory mounting points.
• Secure the diffuser using the compatible clips, screws, and mounting hardware.
• Position the left and right corner extensions against their corresponding bumper locations.
• Check alignment and secure the corner extensions using appropriate mounting hardware.
• Route the integrated LED wiring away from exhaust heat and moving components.
• Connect the LED brake light using the correct vehicle-specific electrical method.
• Test the LED brake light and verify proper operation.
• Check mounting security, exhaust clearance, and overall fitment.
• Professional installation is strongly recommended.
• Test fitting is recommended before final installation.

Fitment

• 2021-2026 BMW G80 M3 Sedan with compatible original rear bumper
• 2021-2026 BMW G82 M4 Coupe with compatible original rear bumper
• Compatible Base, Competition, and selected xDrive configurations with matching rear bumper mounting points
• G83 M4 Convertible compatibility requires separate confirmation
• Not listed for standard BMW G20 3 Series or G22 4 Series models
• Verify rear bumper design, corner mounting positions, and LED electrical compatibility before ordering

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 Retrofits & 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: 1-2 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.