Exterior Components Body Panels and Components

Seibon

Carbon Fiber Rear Diffuser

$1,980.00

SKU: SBN-RD18SBIMP

In Stock
In Stock
Ships by Aug 5
Free Shipping over $100
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Professional / shop required

Description

The Seibon Carbon Fiber Rear Diffuser is a meticulously crafted exterior enhancement for Subaru WRX and STI 4-door sedans with the VA chassis. Constructed from premium, lightweight 3K 2x2 twill weave carbon fiber fabric, this component is designed to offer both aerodynamic benefits and a show-ready aesthetic. Seibon's production team utilizes over 20 years of carbon fiber experience to ensure superior craftsmanship. Each diffuser is built with a consistent weave pattern and an exceptional carbon-to-resin ratio, resulting in high product stiffness and strength. The component is finished with a glossy clear coat that is guaranteed not to chip or flake, providing a stunning, durable surface. It offers a durable and lightweight upgrade without requiring painting, as it is presented in a show-ready finish. Installation of this part requires professional expertise and may involve slight modifications and drilling for a proper fit. Seibon guarantees fitment for US-modeled vehicles, but it is always recommended to confirm compatibility for your specific vehicle configuration. The specific fitment includes 2015-2021 Subaru WRX and 2015-2021 Subaru WRX STI models, as well as 2018-2020 Subaru WRX/STi. The product is also subject to California's Proposition 65 warning regarding potential exposure to Nickel.

MIA's Description

Crafted from premium 3K 2x2 twill weave carbon fiber fabric, this diffuser offers a durable and lightweight solution.

It features a glossy clear coat finish that is resistant to chipping and flaking. The aerodynamic design is intended to generate maximum performance, making it a popular choice among professional race teams. Installation requires professional expertise.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandSeibon
Part NumberSBN-RD18SBIMP
CategoryExterior Components

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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