Mercedes-AMG GT 63 X290 4-Door (2018-2024) Prepreg Dry Carbon Fiber Rear Diffuser

Engineered for Mercedes-AMG GT 4-Door X290 (2018-2024) owners, this Prepreg Dry Carbon Fiber Rear Diffuser brings track-grade aggression to the rear of the four-door grand tourer while reinforcing its aerodynamic character. Manufactured in Europe and quality-controlled by BYC Performance, this GT 63 X290 carbon rear diffuser bolts directly to OEM mounting points.

If your AMG GT 4-Door build needs to surpass the plastic factory diffuser and honor the M177 4.0L V8 biturbo (GT 63: 577 hp, GT 63 S: 630 hp, GT 63 S E PERFORMANCE PHEV: 831 hp combined), this dry carbon rear diffuser is the ideal upgrade. Autoclave-cured prepreg construction delivers a noticeable weight reduction vs. wet-lay carbon.

Key Features

• Prepreg Dry Carbon Technology: Autoclave-cured under high heat and pressure, a more consistent weave.
• Aggressive Diffuser Channels: Designed in harmony with AMG quad-tip exhaust outlets.
• High Strength: Very high strength for its weight.
• Aerodynamic Performance: Optimized channels accelerate underbody airflow.
• 2x2 Twill Carbon Weave: Authentic pattern under UV-protective clear coat.
• Direct OEM Fit: X290 (2018-2024) rear bumper underbody mounting points.
• UV & Chemical Protection: Long-life clear coat.

Prepreg Dry Carbon vs. Wet Carbon — Which Is Better?

Most aftermarket carbon parts use wet lay-up. Prepreg (dry) carbon:

• Autoclave-cured → a more consistent weave
• A controlled resin ratio → lighter, stronger
• The production method widely chosen in motorsport
• Minimal UV fading

Vehicle Fitment

This GT 63 X290 carbon rear diffuser fits:

• Mercedes-AMG GT 53 4MATIC+ X290 (2018-2024) — M256 3.0L I6 + EQ Boost, 429 hp
• Mercedes-AMG GT 63 4MATIC+ X290 (2018-2024) — M177 4.0L V8 biturbo, 577 hp
• Mercedes-AMG GT 63 S 4MATIC+ X290 (2018-2024) — M177 4.0L V8 biturbo, 630 hp
• Mercedes-AMG GT 63 S E PERFORMANCE X290 (2022-2024) — PHEV, 831 hp combined

Important notes:

• NOT compatible with C190 AMG GT (2-door sports car, 2014-2020). C190 is a separate chassis with different rear bumper geometry.
• X290 facelift (2021+) and pre-facelift (2018-2020) share the same rear bumper underbody lines; this diffuser fits both.

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

Care & Maintenance

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

FAQ

Fits C190 GT sports car?
No. C190 (2-door AMG GT sports car) and X290 (4-door Coupé) are entirely different chassis.

Difference between GT 53, GT 63, and GT 63 S?
None for fitment. All three share the same X290 rear bumper and diffuser mounting points.

Fits GT 63 S E PERFORMANCE (PHEV)?
Yes. The PHEV shares the X290 rear bumper geometry.

Pre-facelift and facelift compatible?
Yes. X290 (2018-2024) rear bumper mounting points are shared.

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

Shipping?
In-stock items ship within 1-3 business days via partner couriers.

Warranty?
12-month BYC manufacturer warranty.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading European manufacturers. Our catalog includes AMG GT 4-Door carbon parts, X290 carbon diffusers, BMW M carbon parts, Porsche carbon spoilers, and many more.