ADRO ARD Prepreg Race Diffuser for Toyota GR Supra 2020+

Aero over aesthetic. Function over form. Purpose over compromise.

What is ARD?

ARD (ADRO Racing Division) is ADRO's motorsport engineering program, built for drivers who demand more from their car on track. Every ARD component is developed through CFD simulation and track tested before anything reaches a customer. Scott, ADRO's Head of Aerodynamics, brings an F1 development background to every ARD project. The GR Supra ARD Aero Package is the one of the first full systems to come out of that program.

The Rear Diffuser

A diffuser works by taking the high-velocity, low-pressure air traveling under the car and gradually expanding it back to ambient pressure before it exits at the rear. Done correctly, this expansion accelerates the flow ahead of it, increasing suction across the entire underbody. Done incorrectly, or with gaps and interruptions in the undertray that allow turbulent air to mix in, the pressure recovery breaks down and the diffuser produces a fraction of what it should.

The ARD rear diffuser is developed as the endpoint of a complete underbody system, not a standalone component bolted to the rear bumper.

How It Works

The diffuser undertray seals the gaps that cause turbulent recirculation under the car. On a stock Supra, those gaps allow high-pressure air to bleed into the underbody from the sides and center, disrupting the low-pressure environment the diffuser depends on. Blocking them keeps underbody velocity high across the full floor, which means the diffuser strakes have clean, fast-moving air to work with rather than recovering from turbulence upstream.

The strakes inside the diffuser generate vortices that roll along the diffuser surface, energizing the boundary layer and preventing flow separation as the channel expands. This is what allows the diffuser to extract more work from the airflow without stalling. Those vortices are stronger because of what happens upstream: the ARD undervanes generate large-scale vortices that feed conditioned, high-velocity flow rearward through the floor, arriving at the diffuser inlet with enough energy to drive the expansion process effectively.

As part of the complete ARD Aero Package (in ADRO bumper configuration), the system generates 2148N (483 lbs) of downforce at 180 km/h, a 1618% increase over the GR Supra's stock 125N, with a gain of +2023N (455 lbs) and a 45/55 front-to-rear balance.

Material

ARD components are produced in prepreg carbon fibre. Prepreg uses resin pre-impregnated into the fibre under controlled conditions, meaning resin distribution is precise and consistent throughout the part. The result is a lighter, stiffer component with no soft spots or resin-rich areas that can delaminate under load.

For a rear diffuser, panel stiffness affects more than durability. A diffuser channel that flexes under load changes its expansion geometry, which alters the pressure gradient the strakes are working against. Prepreg holds the designed geometry at speed and under heat, so the diffuser performs consistently across a full session rather than degrading as conditions change.

Vehicle Fitment
This item will suit the following vehicles:

• 2020-2026 Toyota GR Supra
• 2026 Toyota GR Supra Final Edition
• Compatible with our GR Supra A90 Carbon Fibre Rear Diffuser

If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.

Installation
We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.

Note
Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.