2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser

2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser

$880.00
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Fitment:

Make: BMW

Model: 2014–2020 BMW M3 F80 / M4 F82

Year: 2014 - 2020

  • Free Shipping within the Continental US | Worldwide Shipping AVAILABLE

Shop premium parts to enhance your vehicle's performance, style, and customization with high-quality upgrades. This MP Style Rear Diffuser transforms the rear profile of your F80 or F82 with a bold, motorsport-inspired aesthetic. Crafted from premium carbon fibre, it adds aggressive detail while improving airflow and rear-end definition—ideal for both street and track builds.

Modify your car with BayOptiks

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Total price is$880.00CAD
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Pickup available at BayOptiks Dublin Shop

Usually ready in 5+ days

2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser
CFRP - Carbon Fiber
BayOptiks Dublin Shop

Pickup available, usually ready in 5+ days

6743 Dublin Boulevard
#31
Dublin CA 94568
United States

Shop premium parts to enhance your vehicle's performance, style, and customization with high-quality upgrades. This KNF Style Rear Diffuser with LED light transforms the rear profile of your M3 or M4 with bold, track-inspired detail.

Crafted from durable carbon fibre, it enhances aerodynamic flow and brings an aggressive look that stands out day and night thanks to the integrated LED light.

Fitment: 2014–2020 BMW M3 F80 / M4 F82
Package Contents:

  • One Rear Diffuser with LED Light

Made To Order Shipping Information Made-to-Order Items: If a material option shows "MADE TO ORDER", it means that specific option is currently out of stock and will be produced upon order. Customers can choose from the following shipping methods: * Standard Shipping And Handling (no extra cost) with an ETA of 3-4 months. * Expedited Shipping And Handling (additional cost: $550) with an ETA of 5-6 weeks. In-Stock Items: If a product does not display "Made To Order" when selecting a material option, then it is in stock. It will be shipped from our warehouses within 3-5 business days, plus shipping time.

We offer free shipping within the Continental U.S, for Headlights, Taillights, DRLs and Carbahn controllers. For Exterior and Performance products, standard shipping rates apply, We also ship worldwide, with rates automatically calculated at checkout.

Please note:
• For Retrofits, you are purchasing a headlight modification service.
• If you select "Shipping own headlights to BayOptiks for modification", you are required to send us your headlights.
• If you choose "Purchase new OEM headlights", we will order and modify a new OEM headlight for you.
• Once your customizations are complete, we will ship it to you!

  • Complete Headlights: 3-5 business days for order processing plus shipping time.
  • Custom & Pre-Built Headlights: 6-8 weeks depending on the complexity and component availability.
  • New OEM and cores: 6-8 weeks plus an additional 4-8 weeks as these are special orders base on the vehicle VIN due to different versions (North American, European, etc.)
  • DRLs, Taillights and Carbon Fiber Aero: 3-5 business days for order processing, plus shipping time.
  • Lens Replacements: 1-3 weeks plus shipping time.
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2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser - CFRP - Carbon Fiber
Does the 2014-2020 BMW M3 F80 & M4 F82 KNF Style Rear Diffuser - CFRP - Carbon Fiber require professional installation?
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Covered by a 1-Year Warranty
We provide a 1-year warranty on all Headlight DRLs and Taillights, covering any manufacturing defects or malfunctions. For Headlight Retrofits, we offer a 1-year warranty on any defects related to the the services performed by BayOptiks.
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Does the 2014-2020 BMW M3 F80 & M4 F82 BS Style Carbon Fiber Front Lip - CFRP - Carbon Fiber give my car that racy look?
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Are the 2014-2020 BMW M3 F80 VA Style Side Skirts durable?
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Are the 2014-2020 BMW M3 F80 & M4 F82 SM Style Carbon Fiber Rear Caps sturdy?
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Made by real people
We're a full-time shop with a dedicated team, all sharing a passion for modifying headlights and cars. We are focused on delivering an unsurpassed level of quality in our retrofit products and services, to ensure customer satisfaction..
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What are the shipping options for the 2014-2020 BMW M3 F80 & M4 F82 D Style Rear Diffuser - CFRP - Carbon Fiber if it's "Made To Order"?
If "Made To Order," standard shipping takes 3-4 months (free). Expedited shipping (5-6 weeks) costs an extra $550.
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About Us
BayOptiks was established in 2016. The founder started modifying headlights as a hobby in his home garage which has now grown into a full time shop with a team of 8 who all share the same passion for modifying headlights and cars.
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How quickly will the 2014-2020 BMW M3 F80 & M4 F82 SM Style Front Lip ship if it's in stock?
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Warranty Icon

Covered by a 1-Year Warranty

Shop with confidence and peace of mind! We provide a 1-year warranty on all Headlight DRLs and Taillights, covering any manufacturing defects or malfunctions. For Headlight Retrofits, we offer a 1-year warranty on any defects related to the services performed by BayOptiks.

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Why choose BayOptiks?

Made by real people

BayOptiks' journey started when our founder started modifying headlights as a hobby in his home garage. Today, we've grown into a full-time shop with a dedicated team, all sharing the same passion for modifying headlights and cars.

Here, we are focused on delivering an unsurpassed level of quality in our retrofit products and services, committed to ensure customer satisfaction.

We are located in Dublin, California, and for local customers, we offer in-house full-service for your needs, including headlight removal and reinstallation, restoration, repairs, and complete retrofit packages. Our location is 6743 Dublin Blvd, #17, Dublin, CA.

We Offer Local Install

If you're in Dublin, CA, BayOptiks offers professional installation services at our headquarters. Installation is available exclusively for products purchased through our site. Click here to request a quote today!

Perfect fit assured

We ensure our products are a perfect match for your ride by uniquely combining two factors:

Title imagePremium quality products

We offer only the highest quality products, giving you the confidence that it will be the perfect fit for your car.

Title imageExpertise & know-how

With over 8 years of expertise, we are the trusted experts to customize and assemble the perfect part for your vehicle.

Car Image

Transforming your ride

Your car should be more than just a vehicle—it should reflect your style and meet your needs.

Feature Icon 1Our customization services turn your ride into a true extension of your personality, with tailored upgrades that make it more enjoyable.

Feature Icon 2We focus on perfecting every detail, ensuring your car looks and feels exactly how you envision it.

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FAQs

Our custom products are built in-house at BayOptiks headquarters in Dublin, CA, USA. All other products are sourced from vetted manufacturers, and we perform in-house testing to ensure they meet our high-quality standards.

BayOptiks is located in Dublin, CA 94568, USA, where all of our custom products are also made.

Yes, all of our products can be installed at home.

Yes, we offer a 1-year warranty on all our products.

Our customization process is straightforward. You can either ship us your headlights or purchase new OEM headlights, which are required for customizations. For some headlights, we offer a Pre-Built option (a core exchange program) to minimize downtime for your car. If you choose this option, purchase our Pre-Built modified OEM headlights with an additional core deposit. Install the new headlights, send your old ones back to us, and we'll refund your core deposit in full! Here you can check all  Pre-Built options.

Yes, we offer installation services by appointment. If you're interested, click here.

No worries! All our products have been tested for compatibility and functionality. You can also check vehicle compatibility in the product descriptions on each product page.

We accept major credit cards, PayPal, Shop Pay, and payment plans through Affirm, Klarna, and Shop Pay.

Non-custom items are processed within 3-4 business days. Custom items require 6-8 weeks to build before shipping to ensure they are perfect for you.

You can track your order through your optional account or by checking the link on the order confirmation page for the latest status.

Each upgrade option works differently. Detailed descriptions with more information are provided on the product options page for your clarity.