2014-2020 BMW F82/F83 M4 DE Style Rear Diffuser

Transform the rear profile of your BMW M4 with this DE Style rear diffuser. Designed to add a bold, motorsport-inspired appearance, this diffuser creates a more aggressive lower rear profile while complementing the muscular factory body lines of the F82 coupe and F83 convertible.

The sculpted diffuser design adds definition beneath the rear bumper and enhances the vehicle’s aerodynamic presence by helping direct airflow around the lower rear section. Its pronounced styling gives the M4 a wider, lower, and more performance-focused appearance suitable for street, show, and track-inspired builds.

Available in FRP, CFRP, and FGCF material options, this rear diffuser combines durable construction, lightweight performance, and multiple finish choices to match your build. Designed for 2014-2020 BMW F82 and F83 M4 models, each package includes one rear diffuser.

Product Specifications

Key Features

• DE Style rear diffuser designed for the BMW M4
• Designed for 2014-2020 BMW F82 and F83 M4 models
• Creates a more aggressive and motorsport-inspired rear profile
• Available in FRP, CFRP, and FGCF material options
• Adds definition and visual depth to the lower rear bumper
• Enhances aerodynamic presence around the rear of the vehicle
• Complements the M4’s muscular factory body lines
• Offers durable and lightweight exterior construction
• Ideal for street, show, and performance-inspired builds
• Includes one rear diffuser

Configuration Options

• FRP: Durable fiberglass-reinforced plastic construction supplied for preparation and painting
• CFRP: Carbon fiber reinforced polymer construction with a premium woven carbon fiber appearance
• FGCF: Forged carbon fiber construction with a distinctive randomized carbon pattern

Package Includes

• One DE Style rear diffuser

Note: Professional installation is recommended. Test fitting is required before painting or final installation to confirm proper alignment with the rear lower bumper. FRP components may require surface preparation, sanding, priming, and painting. Final fitment may require minor adjustments depending on the vehicle and selected material option.

Installation

• Designed for installation on the rear lower bumper area
• Professional installation is recommended for proper alignment and secure fitment
• Test fit the rear diffuser before painting or final mounting
• Clean and prepare all mounting surfaces before installation
• FRP options require professional preparation and painting before installation
• Drilling, mounting hardware, adhesive, or minor adjustments may be required
• Confirm proper clearance around the exhaust outlets before completing installation

Fitment

• 2014-2020 BMW M4 Coupe F82
• 2014-2020 BMW M4 Convertible F83

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.