Newsletter Sign Up
Receive our latest updates about our products and promotions.





Couldn't load pickup availability
Worldwide Direct. Premium Parts at Your Doorstep.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Elevate the aggressive stance and aerodynamic profile of your Tesla Model S with the CMST Carbon Fiber Rear Diffuser. This premium three-piece kit is engineered specifically for the 2016-2019 Model S, replacing the standard rear valance to reduce rear-end lift and enhance high-speed stability. Crafted by CMST, this diffuser adds a definitive motorsport-inspired aesthetic that complements the vehicle's sleek lines while providing functional downforce.
Constructed from authentic, high-grade carbon fiber, each panel features a precise 3k (2x2) twill weave for that iconic visual texture. The component is protected by a durable UV-resistant clear coat, which preserves the deep, glossy finish and protects the resin from sun degradation and discoloration. For a truly custom look, CMST offers optional forged carbon patterns or a sophisticated matte finish, allowing you to personalize your build.
All CMST carbon fiber components are supplied with the confidence of AME Motorsport's quality guarantee, ensuring you receive a premium, fit-for-purpose product for your high-performance vehicle.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Receive our latest updates about our products and promotions.
Thanks for subscribing!
This email has been registered!
Take 20% off your first order
Enter the code below at checkout to get 20% off your first order