2021-2025 BMW M4 G82/G83 BKSS Style Rear Diffuser

Transform the rear profile of your BMW M4 G82 or G83 with this BKSS style carbon fiber rear diffuser. Designed with aggressive contours and a performance-inspired shape, this exterior upgrade creates a sharper and more commanding appearance while complementing the M4’s factory body lines.

The integrated LED accent light adds a distinctive motorsport-inspired detail to the center of the diffuser, while the included exhaust tips complete the upgraded rear-end configuration. Its sculpted fins and defined lower profile enhance the vehicle’s aerodynamic presence for both street and track-inspired builds.

Crafted from CFRP, FGCF, or DryCF material options, this rear diffuser combines lightweight construction, durable exterior performance, and premium finish quality. Designed for 2021-2025 BMW M4 G82 Coupe and G83 Convertible models, the package includes one rear diffuser with LED light and one set of exhaust tips.

Product Specifications

Key Features

• BKSS style rear diffuser designed for the BMW M4 G82 and G83
• Designed for 2021-2025 BMW M4 Coupe and Convertible models
• Adds an aggressive and performance-inspired lower rear profile
• Available in CFRP, FGCF, and DryCF material options
• Integrated LED accent light creates a distinctive motorsport-inspired appearance
• Includes a matching set of exhaust tips
• Sculpted fins enhance the vehicle’s aerodynamic presence
• Lightweight construction with durable exterior performance
• Complements the factory body lines of the BMW M4
• Suitable for street, show, and track-inspired builds

Configuration Options

• CFRP: Carbon fiber-reinforced polymer construction offering lightweight strength and a premium woven appearance
• FGCF: Forged carbon fiber construction featuring a distinctive textured finish
• DryCF: Lightweight dry carbon fiber construction offering premium strength and finish quality
• Lighting Setup: Integrated LED accent light requires proper electrical connection during installation
• Exhaust Setup: Includes one set of exhaust tips designed to complement the BKSS style diffuser

Package Includes

• One rear diffuser with LED light
• One set of exhaust tips

Note: Professional installation is strongly recommended. Confirm the vehicle’s rear bumper and exhaust configuration before ordering. Test fitting is recommended before final installation. Electrical wiring is required for the integrated LED light, and exhaust tip installation may require adjustment or modification depending on the vehicle’s exhaust setup.

Installation

• Designed for installation on the rear lower bumper area
• Professional installation is strongly recommended for proper alignment and secure fitment
• Test fit the rear diffuser and exhaust tips before completing installation
• Connect the integrated LED light to a compatible electrical source
• Confirm correct LED operation before securing the diffuser
• Verify exhaust tip alignment and adequate heat clearance
• Factory hardware or additional compatible mounting components may be required
• Minor adjustments may be required depending on the vehicle and selected material option

Fitment

• 2021-2025 BMW M4 G82 Coupe
• 2021-2025 BMW M4 G83 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.