Porsche 718 Cayman/Boxster (982, 2016+) Prepreg Dry Carbon Fiber Rear Diffuser

Engineered for Porsche 718 Cayman/Boxster (982 chassis, 2016+) owners who demand racing-grade quality, this Prepreg Dry Carbon Fiber Rear Diffuser transforms the rear of your mid-engine sports car with track-grade aggression while delivering measurable aerodynamic gains. Manufactured in Europe to factory-spec mounting tolerances and quality-controlled by BYC Performance, this Porsche 718 carbon rear diffuser bolts directly to OEM mounting points — no cutting, no drilling, no modification required.

If you're building a serious Porsche 718 tuning project and need a part that exceeds the factory plastic diffuser in both performance and finish, this dry carbon rear diffuser is built for you. Autoclave-cured prepreg carbon fiber is noticeably lighter than wet-lay carbon parts, far superior in structural integrity, and outstanding in long-term UV resistance. Engineered to match the 982-generation Cayman and Boxster's mid-engine chassis philosophy and the breadth of its drivetrain options — from the 2.0L / 2.5L flat-4 turbo to the 4.0L flat-6 NA (GTS 4.0 / Spyder / GT4) — it is the ideal aesthetic and functional 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 homogeneous resin distribution and a more consistent weave.
• Track-DNA Geometry: Multi-channel diffuser geometry accelerates underbody airflow and generates rear-axle downforce at speed.
• Weight Reduction: Noticeably lighter than the factory plastic part; reduces non-rotational mass at the rear axle.
• Race-Grade Strength: Carbon fiber offers very high strength for its weight. Resists stone chips and light contact.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under a high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play installation on factory 718 Cayman / Boxster 982 mounting points.
• UV & Chemical Protection: Long-life clear coat protects against fading, cracking, and exhaust heat.

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

Most aftermarket carbon parts are made using wet lay-up, where resin is applied by hand and cured at room temperature — leaving air voids and inconsistent weight. 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 over years of use

Vehicle Fitment

This Porsche 718 rear diffuser fits the following 982 chassis (2016+) models:

• Porsche 718 Cayman (2016+) — 2.0L flat-4 turbo, 300 hp
• Porsche 718 Cayman S (2016+) — 2.5L flat-4 turbo, 350 hp
• Porsche 718 Cayman GTS 2.5T (2018+) — 365 hp
• Porsche 718 Cayman GTS 4.0 (2020+) — 4.0L flat-6 NA, 400 hp
• Porsche 718 Boxster (2016+) — 2.0L flat-4 turbo, 300 hp
• Porsche 718 Boxster S (2016+) — 2.5L flat-4 turbo, 350 hp
• Porsche 718 Boxster GTS 2.5T / GTS 4.0 (2018+ / 2020+)
• Porsche 718 Spyder / 718 Boxster Spyder 4.0 (2019+) — verify trim aero before ordering
• Porsche 718 Cayman GT4 4.0 (2020+) — Cayman body; verify GT4-specific aero before ordering

Important notes:

• This product is NOT compatible with the previous-generation 981 Cayman/Boxster (2013-2016). The 981 and 982 share different rear bumper geometry.
• A separate carbon diffuser is available for the 718 Cayman GT4 RS (2022+) — this product does NOT fit the GT4 RS motorsport aero package.

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

Installing the Porsche 718 carbon diffuser is a direct replacement of the factory part. Professional installation is 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. 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 981 Cayman/Boxster?
No. The 981 (2013-2016) and 982 (2016+) have different rear bumper geometry. A separate 981 diffuser is in our catalog.

Compatible with both Cayman and Boxster?
Yes. The 718 Cayman (coupé) and 718 Boxster (cabriolet) share identical rear bumper and diffuser mounting points in the 982 generation.

Does this fit the GT4 RS?
No. The 718 Cayman GT4 RS (2022+) uses a motorsport-specific rear aero package; a dedicated GT4 RS diffuser is available separately.

Does this fit the Spyder / GT4?
4.0-engined 718 Spyder and Cayman GT4 use the standard 982 rear bumper, but Spyder/GT4 trim may include trim-specific aero. Please verify your trim before ordering.

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.

Warranty?
BYC Performance offers a 12-month manufacturer warranty.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading European manufacturers and supplying them to the Turkish market. Our catalog includes Porsche carbon parts, Porsche 911 carbon diffusers, Audi R8 carbon rear diffusers, BMW M3 carbon spoilers, and many more high-quality carbon components. All parts undergo strict quality control.