$999.99 Regular price $1,300.00
Shipping calculated at checkout.
Low stock - 3 in stock, ready to ship

Individualize your F8X M3 or M4 with one of the most aggressive diffuser/undertray options. This diffuser features a 4-piece construction with a carbon undertray which helps create downforce at high speeds and gives your F8X a more aggressive, aftermarket look to your rear end. Both pieces feature a 2x2 carbon weave which matches the OEM carbon fiber found on the F8X generation. This diffuser utilizes all OEM mounting points, no drilling required. Please note that while no drilling is required, we still highly recommend professional installation. We guarantee high quality fitment and finish on any carbon fiber/cosmetic part we sell.

F8X M3/M4 

4 Piece Diffuser


  • 2X2 Carbon Fiber Weave
  • High Gloss Clear Coat
  • Excellent Fitment
  • Professional Installation is required 



    • Diffuser requires professional installation from experience aftermarket parts installer. Expect 3-4 hours installation time . No instruction is included . 


    We have a 20-day return policy, which means you have 20 days after receiving your item(s) to request a return. Please note we charge a 25% restocking fee on all returns. To be eligible for a return, your item must be in the same original/new condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at Items sent back to us without first requesting a return will not be accepted. You can always contact us for any return question at Please inspect your order upon arrival, and contact us immediately if the item is defective, damaged or if you received the wrong item, so that we can evaluate the issue and make it right.

    Exceptions/non-returnable items:

    Certain items cannot be returned, like sale items, perishable goods, custom products (such as special orders or personalized items), hazardous materials, flammable liquids, and/or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items or gift cards.


    The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.


    We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember, it can take some time for your bank or credit card company to process and post the refund.