BMW 4 Series G22 G23 Carbon Fiber Rear Diffuser 2021-2023

Upgrade the rear-end styling of your 2021-2023 BMW 4 Series G22 or G23 with this Carbon Fiber Rear Diffuser, designed to add a sharper, sportier, and more aggressive appearance to the factory rear bumper.

Made for BMW G22 Coupe and G23 Convertible models, this rear diffuser enhances the lower rear fascia with a sculpted carbon fiber profile. Its clean design adds visual depth while creating a more dynamic and performance-inspired exterior look.

Constructed from carbon fiber, this diffuser is ideal for BMW owners looking to elevate their 4 Series with a lightweight, premium-quality rear-end upgrade that blends aggressive styling, refined detail, and vehicle-specific fitment.

Product Specifications

Key Features

• Designed for 2021-2023 BMW 4 Series G22 and G23 models
• Carbon fiber construction provides a lightweight and premium exterior upgrade
• Rear diffuser design enhances the lower rear bumper with a sportier profile
• Adds visual depth and aggressive performance-inspired styling to the rear fascia
• Creates a sharper and more dynamic rear-end appearance
• Vehicle-specific styling for a clean and integrated appearance
• Complements other carbon fiber exterior upgrades such as front lips, side skirts, mirror caps, and trunk spoilers

Configuration Options

• Carbon Fiber Finish: Premium carbon fiber styling for a refined rear bumper upgrade

Package Includes

• 1 Carbon Fiber Rear Diffuser

Note: Professional installation is recommended to ensure proper alignment, secure mounting, and best overall fitment. Please confirm rear bumper compatibility before ordering.

Installation

• Installs onto the rear bumper as a diffuser upgrade
• Test fitting is recommended before final installation
• Additional clips, hardware, adhesive, or minor adjustments may be required depending on vehicle condition and installer preference
• Professional installation is strongly recommended

Fitment

• 2021-2023 BMW 4 Series G22 Coupe
• 2021-2023 BMW 4 Series G23 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.