BMW G20 3 Series 330i M340i CMS Carbon Fiber Rear LED Diffuser with Side Spats 2019-2022

Upgrade the rear-end appearance of your 2019-2022 BMW G20 3 Series 330i or M340i with this CMS Carbon Fiber Rear LED Diffuser and Side Spats Kit. Designed specifically for compatible models equipped with the M Sport rear bumper, this three-piece exterior upgrade delivers an aggressive, motorsport-inspired appearance while complementing the vehicle's factory body lines.

Constructed from genuine carbon fiber with a classic twill weave pattern, the CMS-style rear diffuser features a high-gloss, UV-resistant clear-coated finish. Its distinctive shark-fin profile, integrated exhaust-opening design, and matching corner side spats create a bold rear-end appearance. A centrally integrated red LED brake light adds a distinctive lighting detail to the diffuser assembly.

Designed as a replacement for the original rear bumper diffuser, the center section uses factory mounting locations, while the two matching side spats attach using screws and clips. The integrated LED brake light requires electrical wiring during installation. Professional installation is recommended to ensure proper fitment, secure mounting, and correct operation of the lighting system.

Product Specifications

Key Features

• Designed for 2019-2022 BMW G20 3 Series 330i and M340i Sedan models with M Sport rear bumpers
• CMS-style shark-fin rear diffuser with an aggressive motorsport-inspired profile
• Genuine lightweight carbon fiber construction with a classic twill weave pattern
• High-gloss UV-resistant clear-coated finish
• Integrated red LED center brake light
• Matching carbon fiber corner side spats for a coordinated rear-end appearance
• Distinctive exhaust-opening design
• Replacement diffuser designed around factory mounting locations
• Side spats attach using screws and clips
• Three-piece exterior styling kit

Configuration Options

• BMW G20 330i: Compatible 2019-2022 Sedan models equipped with the M Sport rear bumper.
• BMW G20 M340i: Compatible 2019-2022 Sedan models with the appropriate factory rear bumper configuration.
• Material: Real carbon fiber with a high-gloss UV-resistant clear coat.
• Lighting: Integrated red LED center brake light requiring wiring.
• Kit Design: CMS-style center rear diffuser with matching left and right side spats.

Package Includes

• 1 x Real Carbon Fiber Rear Bumper Diffuser with Integrated LED Brake Light
• 1 x Left Carbon Fiber Side Spat
• 1 x Right Carbon Fiber Side Spat

Note: This product is designed for compatible 2019-2022 BMW G20 3 Series Sedans equipped with the M Sport rear bumper only. It is not intended for standard non-M Sport rear bumpers. Please verify your vehicle's model year, rear bumper design, exhaust configuration, and mounting points before ordering. Electrical wiring is required to connect the integrated LED brake light, and installation instructions are not included. Confirm the additional brake light's compliance with applicable road-use regulations. Professional installation is recommended. Test fitting is recommended before final installation.

Installation

• Remove the original rear bumper diffuser from the compatible M Sport bumper.
• Test fit the CMS carbon fiber rear diffuser to verify alignment with the rear bumper and exhaust openings.
• Install the replacement diffuser using the appropriate factory mounting locations.
• Position and secure the matching left and right side spats using the appropriate screws and clips.
• Connect the integrated LED brake light to the appropriate vehicle electrical circuit.
• Test LED brake light operation before completing final assembly.
• Verify all mounting points are secure and check clearance around the exhaust outlets.
• Professional installation is recommended.
• Test fitting is recommended before final installation.

Fitment

• 2019-2022 BMW G20 330i 3 Series Sedan with M Sport rear bumper
• 2019-2022 BMW G20 M340i 3 Series Sedan with compatible factory rear bumper
• Compatible with G20 pre-facelift sedan applications only
• M Sport rear bumper required
• Not compatible with standard non-M Sport rear bumpers
• Confirm rear bumper shape, mounting points, and exhaust configuration 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.