McLaren 540C/570S (2015-2020) Prepreg Dry Carbon Fiber Rear Diffuser

Engineered for McLaren 540C/570S Sports Series owners (2015-2020), this Prepreg Dry Carbon Fiber Rear Diffuser transforms the rear of your supercar with track-grade aggression while delivering aerodynamic gains. Manufactured in Europe to factory-spec mounting tolerances and quality-controlled by BYC Performance, this McLaren 540C carbon rear diffuser bolts directly to OEM mounting points — no cutting, no drilling.

Matched to the Sports Series character of the 540C/570S 3.8L V8 twin-turbo M838TE engine (540C 533 hp, 570S 562 hp), this aggressive diffuser geometry is the ideal aesthetic and functional upgrade for both track and street use. Autoclave-cured prepreg carbon delivers a noticeably lighter build than wet-lay parts, superior structural integrity, and outstanding UV resistance.

Key Features

• Prepreg (Dry) Carbon Technology: Autoclave-cured under high heat and pressure, a more consistent weave.
• Sports Series Aero: Diffuser channels optimized for the 540C/570S rear bumper underside.
• High Strength: Very high strength for its weight.
• Aerodynamic Performance: Channels accelerate underbody airflow and generate downforce at speed.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play on factory 540C/570S mounting points.
• UV & Chemical Protection: Long-life clear coat against fading, cracking, fuel splash.

Prepreg (Dry) vs. Wet Carbon

Prepreg (dry) carbon: Autoclave-cured under high heat & pressure → a more consistent weave, a controlled resin ratio, the production method widely chosen in motorsport, minimal UV fade. Wet lay-up: hand-applied resin, air voids, inconsistent weight.

Vehicle Fitment

• McLaren 540C Coupé (2015-2020) — 3.8L V8 twin-turbo (533 hp)
• McLaren 570S Coupé (2015-2020) — 3.8L V8 twin-turbo (562 hp)
• McLaren 570S Spider (2017-2020) — shares rear bumper geometry, compatible
• McLaren 570GT Coupé (2016-2020) — rear bumper lower diffuser area shared with 570S, compatible

Important notes:

• NOT compatible with McLaren 600LT. The 600LT Longtail aero (extended rear deck, top-exit exhaust) uses different diffuser geometry.
• NOT compatible with McLaren 720S Super Series (different chassis platform - MonoCage II).
• NOT compatible with McLaren Artura (2021+).

Technical Specifications

• Material: Prepreg Carbon Fiber (2x2 Twill Weave)
• Manufacturing: Autoclave Cure
• Finish: High-Gloss Clear UV-Protective Resin
• Color: Natural carbon weave black
• Origin: Europe

Installation Notes

1. Raise the vehicle and remove rear bumper underbody screws.
2. Detach the OEM diffuser from clips and bolts.
3. Test-fit the carbon diffuser.
4. Secure with supplied hardware to the manufacturer's recommended torque.
5. Verify exhaust tips are centered in diffuser cutouts.

Care & Maintenance

Wash with pH-neutral car shampoo. Apply carbon sealant every 6 months. Keep pressure washer 30 cm from surface.

FAQ

Compatible with 600LT?
No. The 600LT Longtail aero is different; a dedicated 600LT diffuser is available.

Compatible with 720S?
No. The 720S Super Series uses a different chassis and diffuser geometry.

Compatible with 570S Spider?
Yes. Spider shares the same rear bumper and diffuser mounting points as the Coupé.

Compatible with 570GT?
Yes. The 570GT's rear bumper lower area matches the 570S.

Will rain damage dry carbon?
No. Autoclave-cured prepreg carbon is fully waterproof.

Shipping?
In-stock items ship within 1-3 business days. International shipping available.

Warranty?
BYC Performance offers a 12-month manufacturer warranty.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading European manufacturers. Catalog includes McLaren 540C carbon parts, McLaren 570S carbon diffusers, McLaren 600LT carbon aero, McLaren 720S carbon parts. Sourced from leading European manufacturers, strict QC.