

Carbon Fiber Rear Diffuser w/ Brake Light - Audi S Line S3/ A3/ RS3 8Y
The Carbon Fiber Rear Diffuser with Brake Light for the Audi RS3 8Y is a high-performance exterior upgrade that combines striking aesthetics with functional performance enhancements. Designed for those seeking to elevate the look and aerodynamics of their RS3, this diffuser is crafted from lightweight and durable carbon fiber, providing both an aggressive, sporty appearance and improved handling characteristics. The integrated brake light adds a unique touch of style and increased safety.
Features:
-
High-Quality Carbon Fiber Construction: Made from premium carbon fiber, the diffuser provides superior strength-to-weight ratio, offering a lightweight yet highly durable solution. The carbon fiber finish gives your Audi RS3 a race-inspired look, elevating the overall appearance of the vehicle.
-
Enhanced Aerodynamics: The rear diffuser is designed to improve the vehicle’s aerodynamics by reducing drag and increasing downforce. It helps to streamline airflow around the rear of the vehicle, which can contribute to better stability and handling at higher speeds.
-
Integrated Brake Light: The built-in brake light not only enhances safety by making your Audi more visible to drivers behind you but also adds a stylish and modern touch to the rear of your vehicle. The brake light ensures visibility and contributes to the overall sporty aesthetic of the diffuser.
-
Perfect Fit for Audi RS3 8Y: Designed specifically for the Audi RS3 8Y, the diffuser fits seamlessly into the rear bumper, making installation easy and ensuring a factory-like appearance. The precision design ensures it integrates perfectly with your vehicle’s existing body lines.
-
Aggressive and Sporty Aesthetic: The carbon fiber rear diffuser enhances the performance-oriented design of the RS3, giving the rear end of the vehicle a more aggressive, race-inspired look. It adds a touch of motorsport flair that sets your car apart from the rest.
-
Durable and Weather-Resistant: Carbon fiber is known for its resistance to harsh weather conditions, meaning this rear diffuser can withstand exposure to the elements without fading, cracking, or losing its structural integrity.
-
Easy Installation: The rear diffuser is designed for straightforward installation with minimal modifications required. With the included mounting hardware, you can quickly and securely attach the diffuser to the rear bumper of your Audi RS3.
-
Improved Rear End Styling: Beyond its functional benefits, the rear diffuser enhances the visual appeal of your RS3 by adding a sleek, high-performance look. It creates a more aggressive and refined rear end that complements the sporty design of the vehicle.
This Carbon Fiber Rear Diffuser with Brake Light for the Audi RS3 8Y is the perfect exterior upgrade to add both style and performance to your vehicle. Whether you're looking to improve aerodynamics or enhance the visual impact of your RS3, this high-quality carbon fiber diffuser provides the perfect blend of form and function.
2021-2023
We want you to have our parts as quickly as possible. Products that are in stock will be shipped and delivered domestically in 1–5 business days. It will take seven to twenty-one business days for international shipment. An email confirming that your order is being completed will be sent to you once you place it. For in-house orders, please allow a day for processing and the updating of the tracking number. The product page accurately shows the quantity.
Custom steering wheels typically take 20-25 business days for production, with an additional 5-7 business days for shipping. Production and delivery times may vary depending on the complexity of the order and the shipping destination. For more details, please refer to our Shipping Policy.
Our Return Policy permits returns only for products that are found to be defective. You have 30 days from the date of delivery to inspect the product and report any issues.
Regular Cleaning: Maintain carbon fiber parts by cleaning them regularly with a soft cloth and a mixture of mild soap and water. Avoid abrasive or harsh cleaners that could harm the finish.
Use Microfiber Pads and Cloths: Opt for microfiber pads and cloths when cleaning or applying protective coatings to prevent surface scratches.
Protect from Sun and Chemicals: Limit exposure to direct sunlight and harsh chemicals, as they can damage carbon fiber. When possible, use protective covers or park your vehicle in shaded areas.

Why Thousands of Enthusiasts Trust Us
Carbon Industries delivers premium, precision-engineered parts that elevate Vehicle performance and style—backed by expert support and a true passion for the culture. We don’t just sell parts; we fuel the lifestyle.
- Guaranteed Fitment for Your BMW: No guesswork—our parts are designed and tested to fit your exact model perfectly.
- Premium Materials, Always: We use only high-grade carbon fiber, forged metals, and performance-tested components.
- White-Glove Customer Support: Our team of BMW specialists is here to guide you with expert, concierge-level care.
- Trusted by the Elite Vehicle Community: From daily drivers to show builds, our parts are featured on some of the cleanest builds worldwide.

Let customers speak for us
FAQ
Will these parts fit my specific BMW model and year?
Yes — every product page includes a “Will This Fit” section to ensure compatibility. If you’re unsure, just send us your VIN or model/year, and our team will confirm fitment for you within 24 hours. We specialize in BMW and European vehicles, so you’re in good hands.
Are these genuine carbon fiber or carbon fiber overlay parts?
We offer only full carbon fiber options. Each listing clearly specifies the construction material. Rest assured, we only source high-quality parts that are durability-tested and made to OEM or better standards.
How long does shipping take and where do you ship from?
Most orders ship from our Irvine, CA warehouse within 1–3 business days. Domestic delivery typically takes 3–7 business days. International shipping times vary by country. Each product page includes real-time shipping estimates based on your location. Certain made to order products will take up to 3-4 weeksfor delivery, including production time.
Do I need professional installation or can I install it myself?
Many of our mods are designed for direct bolt-on installation and can be installed at home with basic tools. However, for certain parts like aero kits or performance components, we recommend professional installation for best results. Each product page includes install difficulty and notes. We offer professional installation at our Irvine, CA location. You caninquire here.
What if the product doesn’t fit or I change my mind?
No worries — we offer hassle-free returns within 30 days of delivery. If the part doesn’t fit due to an error on our end, we’ll cover the return shipping. For all other returns, we make it easy to exchange or get a refund. See our full Returns & Warranty Policy for details.
Are your parts tested for quality and durability?
Absolutely. All of our products go through quality control checks and are either TUV-certified, ISO-certified, or tested by our in-house team and verified installers. We don’t sell anything we wouldn’t put on our own cars.
Do you offer warranties on your parts?
Yes. Most of our products come with a 90-day limited warranty against manufacturing defects. Some premium items offer extended warranties — details are listed on the product pages. We’re committed to quality and stand behind what we sell.
Can I finance or pay in installments?
Yes — we offer Shop Pay, Affirm, AfterPay, and Klarna at checkout. You can split your purchase into 4 interest-free payments or choose longer-term plans if needed. It’s quick, easy, and won’t affect your credit score (in most cases)