



Prepreg Carbon Fiber Rear Diffuser ( M Performance Exhaust Only) - BMW G80 M3 G82 M4
Unlock superior performance and aggressive styling for your BMW G80 M3 or G82 M4 with the Prepreg Carbon Fiber Rear Diffuser designed specifically for M Performance Exhausts. This premium diffuser is engineered to enhance your vehicle’s aerodynamics while offering a sleek, motorsport-inspired aesthetic that perfectly complements the aggressive design of your BMW. Crafted from prepreg carbon fiber, this rear diffuser is lightweight yet durable, ensuring improved stability, handling, and an unmistakable performance look.
Key Features:
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Prepreg Carbon Fiber Construction: Crafted from high-quality prepreg carbon fiber, this rear diffuser provides an ultra-lightweight yet incredibly durable upgrade. The prepreg process ensures consistent strength, durability, and a glossy, race-ready finish. The carbon fiber weave adds a distinctive high-performance look, perfectly matching the aggressive design of the BMW G80 M3 and G82 M4.
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Optimized for M Performance Exhaust: This rear diffuser is specifically designed to work with the M Performance Exhaust System, ensuring a seamless fit and enhanced exhaust exit flow. By improving airflow around the exhaust area, this diffuser enhances the exhaust note and maximizes the performance benefits of your M Performance setup.
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Enhanced Aerodynamics and Downforce: The diffuser's shape and design are engineered to improve rear-end downforce, reducing drag and stabilizing airflow at high speeds. By channeling air more efficiently underneath the vehicle, it contributes to improved grip, handling, and stability, particularly during aggressive cornering or high-speed driving.
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Aggressive, Motorsport-Inspired Aesthetic: The carbon fiber finish of the rear diffuser gives your BMW M3 or M4 a more dynamic, track-ready appearance. The sleek, angular design highlights the vehicle's aggressive rear end and complements the M Performance exhaust system, creating a cohesive, motorsport-inspired look.
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Perfect Fitment for BMW G80 M3 and G82 M4 with M Performance Exhaust: Specifically designed for the BMW G80 M3 and BMW G82 M4 equipped with an M Performance Exhaust, this rear diffuser ensures a perfect, tailored fit. The custom design integrates seamlessly with the vehicle's rear bumper and exhaust system, enhancing both its performance and visual appeal.
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Lightweight and Durable: Prepreg carbon fiber is known for its strength-to-weight ratio, ensuring that the rear diffuser is both lightweight and resilient. The material is highly resistant to UV damage, scratches, and other wear, maintaining its premium appearance even after exposure to the elements.
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UV and Scratch-Resistant Coating: Finished with a UV-resistant, high-gloss coating, this carbon fiber rear diffuser is protected from fading and discoloration caused by prolonged sun exposure. The scratch-resistant finish ensures your diffuser stays looking fresh, even with regular use.
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Improved Stability and Handling: By optimizing airflow and increasing rear-end downforce, this rear diffuser improves the overall stability and handling of your BMW G80 M3 or G82 M4. Whether you're driving on the street or hitting the track, you'll experience better traction and enhanced vehicle control.
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Easy Installation: This prepreg carbon fiber rear diffuser is designed for a straightforward, bolt-on installation with no major modifications needed. The diffuser fits perfectly with your M Performance Exhaust system and requires minimal time for installation, making it an easy upgrade for any BMW enthusiast.
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Seamless Integration with Other Carbon Fiber Components: If you have other carbon fiber upgrades on your BMW M3 or M4, such as front splitters, side skirts, or mirror caps, this rear diffuser will integrate perfectly with those components, creating a cohesive, high-performance look.
Upgrade Your BMW G80 M3 / G82 M4:
Enhance your BMW G80 M3 or G82 M4 with the Prepreg Carbon Fiber Rear Diffuser designed exclusively for M Performance Exhausts. This high-performance upgrade provides improved aerodynamics, stability, and handling, while also giving your vehicle an aggressive, motorsport-inspired appearance. Crafted from lightweight, durable prepreg carbon fiber, this rear diffuser is the perfect way to complement your M Performance Exhaust system and elevate your BMW's performance and styling.
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 Vehicle 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 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)