KB Style Carbon Fiber Rear Diffuser - Audi B8.5 S4 & A4
Save $90.00
Fitment Guaranteed
Wet Carbon Fiber with 2x2 Weave
UV Protectant Clear Coat
24/7 Customer Support
Manufacturer's Warranty
Description
Features
Includes
Save $90.00
Save $90.00
Fitment Guaranteed
Wet Carbon Fiber with 2x2 Weave
UV Protectant Clear Coat
24/7 Customer Support
Manufacturer's Warranty
INSTALLED ON REAL BUILDS
Before/after
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Before
After
FAQ
Product
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.
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.
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 weeks for delivery, including production time.
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 can inquire here.
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.
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.
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.
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)
BUY NOW AND PAY LATER:
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3/6/12
Installment Options
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Easy
Monthly Payments
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0%
APR Available
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$0
Hidden Fees
WHY THOUSANDS OF ENTHUSIASTS TRUST US
Bimmer Plug delivers premium, precision-engineered parts that elevate BMW 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 BMW Community: From daily drivers to show builds, our parts are featured on some of the cleanest builds worldwide.
Pickup & Installation
For those in the Southern California, Bimmer Plug offers the convenience of local pickup and professional installation services at their warehouse, providing a personalized touch to the buying experience.
Hassle-Free Installation: Let us take the work off your hands with our professional installation services, so you can enjoy your purchase without any hassle. Schedule Now.
Reliability and Trust: With a proven track record in the industry, Bimmer Plug is a reliable choice for enthusiasts looking to invest in quality mods, backed by years of experience and positive customer feedback.
Dedicated to Aesthetic Enhancements: Bimmer Plug focuses on mods that enhance the visual appeal of your car, such as body kits, interior trims, and headlights, allowing you to customize the vehicles to match your style.
Free Shipping Worldwide
On all Orders Above $400
Customer Service
24/7 Customer Support
Technical Support
Installation and Technical Help
Premium Quality
Guaranteed for All Products
Let customers speak for us
Great product, i havent installed yet.. definitely looks like high quality carbon, clips and finish looks perfect. I would for sure consider buying more carbon parts from bimmerplug 👍
Opted for the dry carbon mirror caps. Got today and installed each in about 2 minutes. These mirror caps are just what my M3 called for. Fitment was spot on and they had zero blemishes. Do it for your whip.
Amazing product and shipped without issues would def recommend looks the most high quality And genuine
Fit great and looks even better
Awesome color and makes the center console look way better!
Mirrors arrived in perfect condition, fit perfectly with no issues, shipping was fast.
I Received the keys in a very nice packages and will take them to get them configured with my car. They look great and are in great conditions.
Excellent product!! Super easy installation and gives the car a more aggressive look!!
Great service and a great product. Install was a breeze. Thank you!
Great quality, easy installation. Will definitely be ordering again from Bimmer Plug. Great service and quick delivery
Great product so easy to install
Very great product. it fits my car very well, I like it very much and in the future I will buy more products from your store
Ordered M performance stainless steel style pedals and they are great and came in fast as well!
The lights have my M5 a new and more aggressive look! Highly recommended. Delivered on time as promised.
