2018 - 2021 McLaren 600lt Carbon Fiber Under Rear Diffuser Undertray

Enhance the lower rear section of your McLaren 600LT with this carbon fiber rear diffuser undertray. Designed for the P13 chassis, this underbody component complements the vehicle’s existing rear diffuser while adding a premium, performance-inspired finish beneath the rear fascia.

The contoured undertray creates a cleaner and more cohesive appearance across the lower rear underbody area. Its streamlined design adds aerodynamic presence while providing an additional layer of coverage beneath compatible rear diffuser components.

Constructed from lightweight, high-strength carbon fiber, this rear diffuser undertray combines premium materials with vehicle-specific styling. Designed for 2018-2021 McLaren 600LT models, each package includes one carbon fiber rear diffuser undertray.

Product Specifications

Key Features

• Carbon fiber rear diffuser undertray designed for the McLaren 600LT
• Compatible with listed P13 chassis applications
• Complements the vehicle’s existing rear diffuser configuration
• Adds a premium exposed carbon fiber finish beneath the rear fascia
• Creates a cleaner and more cohesive lower underbody appearance
• Provides additional coverage beneath compatible rear diffuser components
• Lightweight carbon fiber construction
• Enhances aerodynamic presence without making unverified performance claims
• Suitable for premium street, show, and track-inspired builds
• Includes one carbon fiber rear diffuser undertray

Package Includes

• One carbon fiber rear diffuser undertray

Note: This undertray is designed to complement a compatible rear diffuser setup. Confirm the vehicle’s model, chassis, production year, factory underbody configuration, rear diffuser design, exhaust routing, and surrounding mounting points before ordering. Rear diffuser components, brackets, fasteners, heat shielding, and installation hardware are not confirmed as included unless otherwise specified.

Installation

• Designed for installation beneath the compatible rear diffuser and rear underbody area
• Professional installation is strongly recommended for proper fitment and secure mounting
• Raise and support the vehicle safely before beginning installation
• Test fit the undertray before drilling, trimming, or completing final installation
• Factory mounting points and compatible hardware should be reused where applicable
• Additional brackets, fasteners, spacers, heat shielding, or custom mounting hardware may be required
• Minor drilling, trimming, sanding, or fitment adjustments may be necessary
• Confirm adequate clearance around the exhaust system, suspension components, diffuser, and surrounding panels
• Inspect all mounting points after the initial installation period

Fitment

• 2018-2021 McLaren 600LT P13
• Verify compatibility with the vehicle’s factory rear diffuser, exhaust, and underbody 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 & 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.