Exterior Components› Body Panels and Components

J's Racing

REAR DIFFUSER FRP

$1,515.00

SKU: RDF-K8-F

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The J's Racing REAR DIFFUSER FRP is a rear diffuser designed as an optional part for the FK8 rear under spoiler. It aims to transform the rear view into a more powerful aesthetic and achieve further rectification effects and downforce. The material is CFRP.
Show original supplier description
The J's Racing REAR DIFFUSER FRP is an optional aerodynamic enhancement designed specifically for the FK8 rear under spoiler. This diffuser not only provides a more aggressive and powerful aesthetic to the rear of the vehicle but also contributes to improved aerodynamic performance by creating rectification effects and increasing downforce. Constructed from CFRP (Carbon Fiber Reinforced Polymer), this rear diffuser offers a blend of lightweight strength and durability. It is specifically molded to complement the J's Racing muffler; however, owners with aftermarket muffler replacements may need to perform cutting to ensure proper fitment. Installation requires drilling to secure the bolts and nuts. The product's design prioritizes downforce, and users should be aware that if using the genuine jack-up point, a marking part may need to be cut. It is essential to perform fitting and painting before the final installation of this product. This diffuser is exclusively for the FK8 TYPE-R models.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandJ's Racing
Part NumberRDF-K8-F
CategoryExterior Components

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Returns & Fitment

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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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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