Description
NOTE: Optional part for the FK8 Rear Under Spoiler (JS-AR-K8-F). Since it is molded with a J's Racing muffler, cutting may be required for vehicles with external mufflers. Drilling is required to secure the bolts and nuts for installation. If you use the genuine jack-up points, please cut the marked parts. FRP is unpainted.
Unlock serious rear-end aero with a dedicated rear diffuser engineered for the FK8. Designed as an add-on to the Rear Under Spoiler, it aggressively sharpens the rear view while improving airflow management for enhanced stability and downforce. The diffuser’s profile prioritizes downforce effect, helping to streamline underbody airflow and reduce turbulence for a planted, high-speed feel.
Available in lightweight constructions to suit your build. The carbon type utilizes vacuum infusion molding, minimizing resin irregularities and air bubbles versus conventional methods for excellent strength-to-weight performance. FRP is supplied unpainted for easy finishing to your preference. Both variants are shaped for optimal fitment with the associated under spoiler and performance exhaust geometry.
Installation requires basic fabrication skills: drilling to secure hardware, and potential trimming when used with non-standard mufflers. Clear markings guide any necessary cuts, including at factory jack-up points when applicable.
Whether for street or track-focused setups, this diffuser elevates aerodynamics, adds an aggressive motorsport aesthetic, and delivers functional downforce to help maximize the FK8’s handling potential.
*Product images may show painted finishes (e.g., matte black) for reference.