K Style Carbon Fiber Rear Diffuser w/ Integrated Brake Light - F80 M3 | F82 / F83 M4

Regular price $599.99 Sale price $499.00
Shipping calculated at checkout.

1 in stock

Create an aggressive, aftermarket look with our K-Style fully carbon diffuser for the F8X M3 and M4. This diffuser includes a functional F1-Style LED brake-light that will work seamlessly with your normal, OEM brake lights. We include the wiring harness necessary for the installation. The K-Style diffusers are made using our same genuine 2x2 carbon fiber fabric as our other M3 and M4 parts. Each piece is equipped with an OEM-like clear coat which protects against the harmful affects of UV rays and small rock chips. Every carbon fiber part we sell is quality checked and repackaged prior to shipping to ensure that you are receiving only the highest quality carbon fiber product. We recognize how important fitment is on carbon fiber parts and we promise high quality fitment on every product because details are so crucial. Due to the wiring required to install this diffuser, we strongly recommend professional installation. If you have any questions or concerns regarding this diffuser please reach out to us via the contact tab above.

All pictures were sent to us by our clients!


- F80 M3 (2015-2019)

- F82/F83 M4 (2015-2020)


Please contact us via the contact page form to start a return or exchange. The return/exchange process must be started within 1 week of delivery, after 1 week we will not be able to issue a refund/exchange. A 20% restocking fee will be applied to any return once the order has been shipped. For any questions regarding returns or exchanges feel free to contact us at sales@horizonmotorsport.com or reach out to us via the contact form and we would be happy to help.

You can find additional details on our return and exchange policy here.




Horizon Motorsport has one goal: to make our clients happy. We aim to provide the highest level of customer service and the highest caliber parts, all at the most competitive prices. Have a question or concern about a product we sell? Send us an email at sales@horizonmotorsport.com.


Every piece of carbon fiber that leaves our location in Los Angeles, CA is quality checked extensively prior to shipment. Every piece is backed up by our fitment and finish guarantee.


At Horizon Motorsport our mission is to provide unparalleled customer service. As a small business we pride ourselves on creating long lasting relationships with our customers who know that they can count on us for any of their BMW needs.


Horizon Motorsport was founded in 2019 in Los Angeles, CA by fellow BMW enthusiasts. We have experience with nearly all makes and models and have been actively involved in the Southern California BMW scene for over 3 years. Because of our unique insight into the BMW community, we choose to carry only the highest quality parts from the highest quality brands on the market.