The IS's rear bumper ends in a wide panel of body-color plastic below the exhaust trim. Straight on, it is the flattest surface on the car and the one place the design stops finishing the thought.
A Feral Auto design, not a copy of any Lexus part, built from 3K premium carbon fiber and shaped to the IS's own rear bumper, with vertical strakes that carry the eye across the full width rather than sitting as a single flat plate. It is an add-on, not a replacement: it mounts onto the factory rear diffuser, which stays on the car.
Pairs with the Carbon Fiber Side Skirts and Carbon Fiber Roof Spoiler, which fit the same year range, and with the 2026+ Carbon Fiber Front Spoiler and Carbon Fiber Rear Wing. All five carbon pieces come together in the Carbon Aero Bundle Kit for the 2026-2027 IS350 F-Sport and F-Sport Design. The same diffuser in FRP costs less and ships primed for paint.
Fits the 2021-2025 Lexus IS300 and IS350 (Base and F-Sport) and the 2026-2027 IS350 F-Sport and F-Sport Design. It does not fit the IS500.
Why Carbon Fiber
Carbon fiber earns its place over factory plastic on three counts. It holds a crisp edge where plastic softens and rounds off. It resists the flex and sag that makes a long lower part look tired after a season. And the weave is the finish itself rather than a coating applied over it, so a scuff doesn't expose a different color underneath.
A diffuser sits lower than anything else at the back of the car and takes whatever the rear tires throw at it — stone chips, road salt, exhaust heat. Strake edges are where a molded plastic part loses its definition first, and where the weave being the finish itself earns its keep.
Please note: Matte, Honey Comb, and Forged Carbon finishes are non-refundable once the order has been placed.
Browse all Feral Auto Lexus IS aero parts.
Free standard shipping on all orders delivered within the 48 contiguous United States.
In-stock parts are prepared for shipment within 1–3 business days. If a part is not currently in stock, the lead time shown under the Add to Cart button applies. Once a shipment leaves our facility, most orders arrive within 3–7 business days, and freight shipments within 5–10 business days.
We also ship to Alaska, Hawaii, U.S. territories, APO/FPO/DPO addresses and internationally by quote — contact us before ordering. Full details in our Shipping policy.
Returns require our approval. Contact us within 5 days of receiving your item to request one. Approved returns are subject to a 30% restocking fee plus return shipping, and original shipping is non-refundable.
Items that have been installed, used or modified cannot be returned. Non-standard carbon finishes are non-returnable once the order has been placed.
If we shipped the wrong part or it has a manufacturing defect, there is no fee and we cover return shipping. Damage in transit must be reported within 24 hours of delivery — see our Shipping policy. Carbon components carry a 6-month structural and finish warranty. Full details in our Refund policy.
