Carbon Fiber Rear Diffuser - Audi S5/A5 B9 S- Line
Enhance the rear-end aesthetics and aerodynamics of your Audi S5/A5 B9 S-Line with the Carbon Fiber Rear Diffuser. Crafted from premium carbon fiber, this diffuser offers both style and functionality. Key features include:
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Aerodynamic Design: Improves airflow management, reducing drag and potentially increasing downforce for enhanced stability at high speeds.
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Premium Material: Lightweight yet durable carbon fiber construction ensures strength and resistance to elements.
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Enhanced Styling: Adds a sporty and aggressive look to your Audi S5/A5 B9 S-Line, complementing its overall aesthetic appeal.
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Perfect Fitment: Engineered to seamlessly integrate with the rear bumper, maintaining a factory-like fit and finish.
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Easy Installation: Designed for straightforward installation with basic tools, minimizing installation time and effort.
Upgrade your Audi S5/A5 B9 S-Line with this carbon fiber rear diffuser to achieve a refined balance of style and aerodynamic performance, perfect for enthusiasts seeking to enhance their vehicle's appearance and driving experience.
Fitment:
Audi S5 A5 B9 Sline 2017-2019
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.
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.
Why Thousands of
Enthusiasts Trust Us
The Carbon Industries delivers premium, precision-engineered parts that elevate Mercedes performance and style—backed by expert support and a true passion for the culture.
Vehicle-Specific Fitment
Each part is designed for a specific make, model and generation. Enter your vehicle to confirm it fits before you buy.- Premium Materials, Always
We use only high-quality carbon fiber construction known for lightweight strength and durability. - UV Protection
Finished with a UV-resistant clear coat that protects against fading and discoloration.
Your hands will know the difference
A custom carbon fiber steering wheel isn't just a look, it's the first thing you touch every time you drive. The weave, the weight, the grip, all built around your car and your style, so the cockpit feels as dialed-in as the rest of the build.
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The material every serious builder need
Carbon fiber isn't a trend, it's what separates a serious build from a show car. Strength without the weight, precision without the guesswork. On modern performance cars, it's stopped being an upgrade and started being the standard. We just make sure yours fits like it was born there.
Shop nowBuilt for the ones who notice gaps
You've seen our work. You just didn't know it.
We've seen the horror stories — panel gaps, mismatched clearcoat, parts that "should" fit. Not here. Every piece is checked against the car it's going on, not just the spec sheet. That's why the same names keep coming back.
GOT QUESTIONS?
FREQUENTLY ASKED QUESTIONS
Will these parts fit my specific Vehicle model and year?
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 Santa Clara, CA location.
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)
