McLaren 540C / 570S | Prepreg Dry Carbon Fiber Door Sill

McLaren 540C/570S (2015-2020) Prepreg Dry Carbon Fiber Door Sill

Engineered for McLaren 540C/570S Sports Series owners (2015-2020), this Prepreg Dry Carbon Fiber Door Sill refreshes the inner and outer sill area with track-grade carbon. Made to factory-spec mounting tolerances by leading manufacturers around the world and quality-controlled by BYC Performance, this McLaren 540C carbon door sill bolts directly to OEM mounting points.

Designed to complement the dihedral door geometry of the carbon MonoCell II monocoque chassis, the sill showcases authentic carbon weave during entry and exit, while replacing the OEM plastic panel with a far more durable upgrade.

Key Features

• Prepreg (Dry) Carbon Technology: Autoclave-cured under high heat and pressure.
• MonoCell II Compatibility: Optimized for dihedral door + sill geometry.
• High Strength: Very high strength for its weight, handles daily entry wear.
• 2x2 Twill Carbon Weave: Authentic pattern under UV-protective clear coat.
• Direct OEM Fit: Snaps onto factory 540C/570S mounting clips.
• UV & Chemical Protection: Resistant to fading and fuel/tar splash.
• Left + Right Set: Driver + passenger side included.

Prepreg (Dry) vs. Wet Carbon

Prepreg carbon is autoclave-cured with a more consistent weave and a controlled resin ratio: the production method widely chosen in motorsport. Wet lay-up is hand-applied with voids.

Installation Notes

1. Open the door fully.
2. Remove the OEM plastic sill panel from clips.
3. Press the carbon sill onto the clips.
4. Close the door and check alignment.

Care & Maintenance

Wash with pH-neutral shampoo. Take care during entry/exit: optional paint protection film recommended.

FAQ

Compatible with 570S Spider?
Yes. Spider shares the same door + sill geometry as the Coupé.

Compatible with 570GT?
Yes. 570GT door + sill is shared with the 570S.

Compatible with 600LT?
No. 600LT Longtail uses different sill geometry.

Compatible with 720S?
No. 720S Super Series uses a different chassis platform.

Sold as left + right set?
Yes. Driver + passenger side included.

Shipping?
In-stock items ship within 1-3 business days via partner couriers. Parts sourced to order are delivered within 30 days of the order date at the latest.

Warranty?
Manufacturing defects are covered by a 24-month BYC warranty, in addition to your legal rights.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading manufacturers around the world. Catalog includes McLaren 540C carbon door sills, 570S carbon parts, 600LT carbon aero, 720S carbon parts.