Mercedes C257 Sport CLS53 Carbon Fiber Side Skirt Extensions 2018–2020

Carbon Fiber Side Skirt Extensions for Mercedes-Benz C257

Add a gloss woven-carbon accent along the existing side skirts of your CLS. These extensions are source-listed for selected C257 Sport models and CLS53 AMG within the combined 2018–2020 range. They are exterior styling additions, not replacement structural rocker panels.

Listed Fitment

• Mercedes-Benz CLS-Class C257.
• Sport models listed: CLS300, CLS350, CLS450, CLS220d, CLS300d, CLS350d and CLS400d.
• CLS53 AMG is also listed.
• Detailed years: 2018, 2019 and 2020.
• Explicit exclusion: C257 Base models.

The visible source describes the body as Sedan, while existing hidden filtering uses Coupe terminology and includes a 2017 entry. These references are not a basis to expand fitment to another body or 2017. Confirm VIN, production date, market, actual C257 body and the original Sport/CLS53 side-skirt profile before ordering.

No complete model-by-year or drivetrain matrix is supplied. Do not assume every listed engine applies in every year or that hidden EQ Boost/4MATIC references establish every drivetrain combination. Other generations, unlisted models, later years and aftermarket side skirts are not established applications.

Material and Finish

• Source-specified 3×3 weave carbon fiber reinforced with a glass-fiber composite.
• High-gloss lacquer finish, described as hand- and machine-polished.
• Source-described double-layer anti-UV clear-coat protection; the introduction also refers to clear-coat wax without naming a product or application specification.
• Development described as 3D design, CNC molding and vehicle trial installation.

No dry-carbon or prepreg process, carbon-only laminate, resin chemistry, layer thickness, dimensions or measured net weight is supplied. UV protection does not guarantee permanent gloss or freedom from fading. Matching other carbon accessories is not guaranteed.

No supporting test data establishes aerodynamic gains, reduced drag, improved handling, quantified strength or weight savings. These extensions are presented as exterior styling accessories. Trial-fit and development descriptions do not guarantee perfect fit on every vehicle.

Extension Scope and Package

The source specifically describes mounting onto the existing side skirts. Verify the original skirt profile and intended mounting footprint; do not treat these items as complete replacement skirts, structural sills, running boards or jacking points.

Self-tapping screws and tape are specifically listed as included. Exact quantities, screw dimensions, tape brand, thickness and pre-application status are not supplied. Plural skirts wording does not establish an exact physical piece count or a confirmed left/right pair. Confirm side allocation and the complete packing list before ordering.

Additional brackets, replacement clips, lights and wiring are not individually confirmed as included. No complete mounting diagram, torque values or evidence of existing-hole compatibility is provided. Included self-tapping screws do not establish a no-drilling installation; included tape does not establish sufficient retention without the verified mechanical fastening.

Professional Installation Guidance

1. Inspect and trial-fit all supplied sections against the actual original skirts before drilling or removing adhesive backing. Confirm alignment, end positions and even contact without forcing the composite.
2. Check door opening, lower seals, wheel-arch and tire clearance, ground clearance and access to factory jacking points. Preserve drainage openings and any fitted lighting or wiring.
3. Confirm secure attachment points and inspect behind proposed holes for wiring, lines and other components. Do not drill structural sill areas or improvise attachment without a verified installation design.
4. Clean and dry adhesive contact areas with products compatible with the original finish and actual tape. Resolve film, paint damage or contamination before installation.
5. Follow the actual tape manufacturer's preparation, application-temperature, pressure and curing requirements. Do not assume a fixed cure time or that a one-hour fitting claim includes curing.
6. Complete the verified mechanical fastening and adhesive procedure. Check retaining points, door operation and clearances before driving.
7. Reinspect periodically and after scraping, impact, lifting or bodywork. Do not drive with loose, cracked or lifting sections.

Professional installation is recommended. The original one-hour, no-modification and perfect-fit promises are not retained. Do not stand on the extensions or place jack/lift loads on them; use the vehicle's designated structural lifting points with unobstructed access.

Care

Use a soft cloth and non-abrasive products compatible with the gloss coating. Avoid aggressive solvents and close-range high-pressure water at edges and attachment points. Follow adhesive-specific washing restrictions during curing. Inspect the coating, laminate and fasteners for cracking or loosening.

Frequently Asked Questions

Are these complete replacement side skirts?
No. The source describes extensions mounted to the existing side skirts.

Do they fit Base models?
C257 Base is explicitly excluded. Verify the actual Sport/CLS53 skirt profile.

Does the 2017 hidden-filter entry expand the year range?
No. The detailed visible fitment lists 2018–2020; 2017 is not established.

Is the laminate carbon-only or dry carbon?
The source states carbon fiber with glass-fiber reinforcement. Dry-carbon processing is not documented.

Are tape and screws included?
Yes, self-tapping screws and tape are listed. Exact quantities and specifications are not provided.

Are two pieces supplied?
An exact physical piece count and left/right breakdown are not documented.

Can they be used as steps or lifting points?
No. They are styling extensions, not load-bearing sills or running boards.

Is installation drilling-free?
Existing-hole compatibility is not documented. Have the installer verify the mounting procedure before modifying anything.