Audi S7/A7 C8 Sportback (2017-2024) Prepreg Dry Carbon Fiber Rear Diffuser

Engineered for Audi S7/A7 C8 Sportback (2017-2024) owners, this Prepreg Dry Carbon Fiber Rear Diffuser adds motorsport-inspired aggression and aerodynamic balance to your fastback rear. Manufactured in Europe and quality-controlled by BYC Performance, this Audi C8 carbon rear diffuser bolts directly to OEM mounting points — no cutting, drilling, or modification.

If you're building a serious Audi A7 C8 tuning or S7 Sportback modification project and need a premium-grade rear diffuser, this dry carbon piece is the right answer. The C8 A7 generation offers A7 with 2.0 TFSI MHEV / 3.0 TDI and S7 with 2.9 TFSI V6 biturbo (444 hp ROW) or 3.0 TDI V6 MHEV (349 hp EU). Autoclave-cured prepreg carbon is noticeably lighter than plastic OEM and offers vastly better UV resistance.

Key Features

• Prepreg Dry Carbon Technology: Autoclave-cured under high heat and pressure — a more consistent weave.
• Sportback Aerodynamics: Diffuser channels optimized for the 5-door fastback rear.
• High Strength: Carbon fiber offers very high strength for its weight.
• Aerodynamic Performance: Improves rear-axle downforce balance at high speed.
• 2x2 Twill Carbon Weave: Genuine carbon pattern under high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play installation on Audi S7/A7 C8 Sportback mounting points.
• UV & Chemical Protection: Long-life clear coat protects against fading, cracking, and road chemicals.

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

Most aftermarket carbon parts use wet lay-up — hand-applied resin, room-temp cure, voids and inconsistent weight. Prepreg dry carbon:

• Autoclave-cured under high heat and pressure → a more consistent weave
• Controlled resin ratio → lighter and stronger
• The production method widely chosen in motorsport
• Minimal UV fading over years of use

Vehicle Fitment

This Audi C8 A7 rear diffuser fits the following models:

• Audi A7 Sportback C8 (2017-2024) — 45 TFSI / 55 TFSI / 45 TDI / 50 TDI
• Audi S7 Sportback C8 (2019-2024) — 2.9 TFSI V6 biturbo (ROW 444 hp) / 3.0 TDI V6 MHEV (EU 349 hp)

Important notes:

• This product is NOT compatible with the Audi RS7 Sportback C8. RS7 has a unique rear bumper and exhaust outlet geometry designed for the 4.0 TFSI V8 biturbo.
• This product is NOT compatible with the previous-generation Audi A7/S7 C7 (2010-2018).
• A7/S7/RS7 C8 is produced only as a Sportback (5-door fastback) — no Sedan or Avant body style exists.

Technical Specifications

• Material: Prepreg Carbon Fiber (2x2 Twill Weave)
• Manufacturing: Autoclave Cure
• Finish: High-Gloss UV-Protective Clear Resin
• Color: Natural carbon weave black
• Origin: Europe

Installation Notes

The Audi S7/A7 C8 carbon diffuser is a direct OEM replacement. Professional installation recommended:

1. Raise the vehicle and remove rear bumper underbody screws and clips.
2. Detach the OEM plastic diffuser around exhaust tips.
3. Test-fit the carbon diffuser for alignment.
4. Secure with supplied hardware to the manufacturer's recommended torque.
5. Verify 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

Does this fit the Audi RS7 C8?
No. RS7 uses a unique rear bumper and exhaust geometry; RS7 owners should contact BYC for diffuser options.

Any body style besides A7 Sportback?
No. A7/S7/RS7 C8 is Sportback-only (5-door fastback).

Does this fit the previous-generation C7 (2010-2018)?
No. C7 and C8 use different bumper geometry.

Any fitment difference between A7 and S7?
No. C8 A7 and S7 share rear bumper geometry.

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

Shipping time?
In-stock items ship within 1-3 business days via partner couriers. 1-2 day delivery across Turkey.

Warranty?
BYC Performance offers a 12-month warranty against manufacturing defects.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading European manufacturers. Our catalog includes Audi RS carbon diffusers, Audi C8 carbon parts, BMW M carbon spoilers, Porsche carbon diffusers, and many more, all under strict QC.