Mercedes-Benz C257 Sport / CLS53 AMG Carbon Side Skirt Extensions 2018–2022

Carbon Fiber Side Skirt Extensions for Mercedes-Benz C257

Add a gloss woven-carbon accent along the lower sides of your CLS. These extensions are described as attaching to the existing side skirts on the source-listed C257 Sport and CLS53 AMG applications, complementing other exterior accents without replacing structural rocker panels.

Listed Fitment

• Mercedes-Benz CLS Class C257.
• Source-listed Sport applications: CLS300, CLS350, CLS450, CLS220d, CLS300d, CLS350d and CLS400d.
• CLS53 AMG is also listed.
• Detailed source body description: Sedan.
• Combined listed years: 2018, 2019, 2020, 2021 and 2022.
• Explicit exclusion: C257 Base models.

The source combines model names and years, rather than providing a model-by-year or drivetrain-specific compatibility table. Do not assume every listed model exists or fits in every year and market. Confirm VIN, production date, actual side-skirt profile and the relevant Sport or CLS53 AMG configuration before ordering, including any facelift-related trim differences.

The original title and URL also use W257, while the detailed fitment identifies C257. This listing follows the detailed C257 designation; W257 naming alone is not additional compatibility evidence. The visible source calls the vehicle Sedan, while hidden vehicle-filter entries use Coupe wording and include a 2017 entry. These differences do not establish another body style or extend the stated 2018–2022 range. Confirm the exact vehicle rather than relying on either body-style label alone.

Base models are excluded. Other generations, unlisted trims, modified side skirts and aftermarket body conversions are not established applications.

Material and Finish

• Source-specified 3×3 weave carbon fiber.
• Glass-fiber composite reinforcement described in the construction.
• High-gloss lacquer, with hand and machine polishing described.
• Source-described double-layer UV-protected clear coating.
• Development described as 3D design, CNC molding and vehicle trial installation.

The introductory clear-coat/wax wording does not provide a separate coating-system specification. UV protection is not a guarantee of permanent gloss or freedom from fading. Dry carbon, prepreg, resin chemistry, carbon percentage, thickness and measured net weight are not specified.

No test results substantiate increased downforce, reduced drag, handling improvements or quantified weight reduction. These are exterior styling extensions, not proven aerodynamic upgrades. Development-process and trial-fit descriptions do not guarantee fit on every vehicle.

Installation Scope and Included Attachment Material

The source describes mounting the extensions to the existing side skirts. They are not established as full replacement skirt assemblies, structural sills, steps or jacking points.

• Tape is explicitly listed as included.

The introduction mentions supplied hardware generically, but the detailed installation list identifies only tape. Screws, self-tapping screws, brackets and other fasteners are not individually confirmed. Do not assume the contents match another side-skirt product.

Exact physical piece count, left/right packing breakdown, dimensions and attachment layout are not documented. Tape brand, amount, thickness, pre-application status and curing conditions are not supplied. Verify the actual packing list and approved fastening method; included tape alone does not establish adequate retention for an unsuitable surface or poor fit.

Professional Installation Guidance

1. Inspect the original skirts, underside and supplied extensions. Trial-fit before removing tape backing or making permanent changes. Check full contact, end alignment, door clearance and surrounding panels without forcing the composite.
2. Preserve access to designated lifting points, drainage and service areas. Never stand on the extensions or use them to support or raise the vehicle.
3. Confirm paint and adhesive compatibility. Clean and dry contact surfaces using products appropriate for the vehicle finish and actual tape.
4. Follow the tape manufacturer's preparation, temperature, pressure and curing instructions. Do not assume a fixed cure time or apply adhesion promoter without verifying compatibility.
5. Confirm whether the approved installation requires additional retention. No drilling template, fastener specification or torque values are supplied; do not improvise screws or replace required mechanical fastening with tape.
6. Check secure retention, door operation, ground clearance and service access before driving. Reinspect periodically and after washing, impact or underside work.

Professional installation is recommended. Original one-hour, no-modification and perfect-fit claims are not retained as guarantees. Do not drive with loose, lifting, cracked or dragging extensions.

Care

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

Frequently Asked Questions

Does it fit C257 Base?
No. Base models are explicitly excluded in the source.

Are all listed CLS models confirmed for every year from 2018–2022?
No model-by-year matrix is supplied. Verify the exact vehicle, trim and skirt interface.

Why does the original name also say W257?
The title uses both W257 and C257, while the detailed fitment specifies C257. Confirm the vehicle using VIN and actual trim.

Is this a complete replacement skirt?
The source describes add-on extensions attached to the existing side skirts.

Are these dry carbon?
Dry-carbon construction is not specified. Carbon fiber with glass-fiber reinforcement is described.

Are screws included?
Screws are not individually listed. Tape is the explicit attachment material; generic hardware wording is not proof of screw inclusion.

Is the tape pre-applied?
That detail is not supplied.

How many pieces are included?
An exact physical piece count and left/right breakdown are not documented.