Mercedes-Benz AMG CLA C118 | Prepreg Dry Carbon Fiber Rear Diffuser

Mercedes-Benz AMG CLA C118 (2019+) Prepreg Dry Carbon Fiber Rear Diffuser

Engineered for Mercedes-Benz AMG CLA C118 second-generation (2019+) owners, this Prepreg Dry Carbon Fiber Rear Diffuser brings CLA45 S AMG-grade aero aggression to the rear of your modern sedan while contributing to aerodynamic performance. Made to factory-spec mounting tolerances by leading manufacturers around the world and quality-controlled by BYC Performance, this CLA C118 carbon rear diffuser bolts directly to OEM mounting points.

If you're building a serious CLA C118 tuning project and need a part that exceeds the factory plastic diffuser, this dry carbon rear diffuser is built for you. Autoclave-cured prepreg carbon fiber is noticeably lighter than wet-lay parts, with superior structural integrity. Engineered to match the CLA45 S AMG's M139 2.0L turbo (387-421 hp, the world's most powerful production 4-cylinder), this aggressive diffuser is the ideal upgrade for both track and street use.

Key Features

• Prepreg (Dry) Carbon Technology: Pre-impregnated carbon plies cured in an autoclave under high heat and pressure ensure a more consistent weave.
• AMG-Inspired Geometry: Aggressive diffuser channels inspired by the CLA45 S AMG's DTM racing DNA.
• Race-Grade Strength: Carbon fiber offers very high strength for its weight.
• Aerodynamic Performance: Optimized diffuser channels accelerate underbody airflow and generate downforce.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under a high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play installation on factory Mercedes CLA C118 (2019+) mounting points.
• UV & Chemical Protection: Long-life clear coat protects against fading, cracking, fuel splash, and road tar.

Prepreg (Dry) Carbon vs. Wet Carbon

Most aftermarket carbon parts use wet lay-up, where resin is applied by hand and cured at room temperature, leaving voids. Prepreg (dry) carbon:

• Cured in an autoclave under high heat and pressure → a more consistent weave
• A controlled resin ratio → lighter and stronger
• The production method widely chosen in motorsport
• Minimal UV fading

Installation Notes

Professional installation recommended:

1. Raise the vehicle and remove rear bumper underbody screws.
2. Detach the OEM plastic diffuser from clips and bolts.
3. Test-fit the carbon diffuser for alignment.
4. Secure with supplied hardware to the manufacturer's recommended torque.
5. On CLA45/45 S, verify exhaust tips are centered in diffuser cutouts.

Care & Maintenance

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

FAQ

Does this fit the Mercedes CLA C117 (2013-2019)?
No. C117 and C118 are different generations with completely different rear bumper geometry. A separate C117 carbon diffuser is available.

Difference between CLA45 S AMG and CLA250?
The rear diffuser mounting points are shared; this part fits both CLA45/45 S and AMG-pack CLA250 trims.

Compatible with the CLA Shooting Brake (X118)?
Yes. The X118 Shooting Brake wagon shares the same rear diffuser.

How powerful is the M139 engine?
The M139 2.0L turbo is the world's most powerful production 4-cylinder: 387 hp in CLA45, 421 hp in CLA45 S.

Will rain damage dry carbon parts?
No. Autoclave-cured prepreg carbon is fully waterproof and weather-resistant.

Shipping time?
In-stock items ship within 1-3 business days. International shipping available. 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 and supplying them to the Turkish market. Our catalog includes Mercedes AMG carbon parts, CLA C118 carbon diffusers, C63 W205 carbon diffusers, BMW M3 carbon diffusers, and many more high-quality carbon components.