Toyota GR Supra ARD Prepreg Race Undervanes 2020+

ARD prepreg race undervanes mount under the GR Supra's front bumper and work with the ARD front lip to manage airflow under the nose. They're usually added as part of a full ARD front setup rather than on their own. We can fit them with the lip and canards in one visit.

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

What is ARD?

ARD is ADRO Racing Division, the company's motorsport engineering arm, aimed at cars that spend real time on track. Each ARD part is developed in CFD and tested on track before it goes on sale. ADRO's head of aerodynamics, Scott, comes from a Formula 1 development background and leads ARD's work. The GR Supra ARD Aero Package is one of the first complete systems from ARD.

The Undervanes

The component most aero kits ignore completely. The one that separates visual modifications from genuine aerodynamic systems. Most kits stop at the surfaces you can see: wings, splitters, canards. The underside of the car is where the most significant aerodynamic gains live, and it is where most kits do nothing at all.

How It Works

Six vanes are strategically positioned beneath the Supra's chassis to transform underbody airflow management. They generate large-scale vortices that dramatically increase suction on the lower surface, pulling the car toward the track with measurable force. Simultaneously, they direct airflow outboard, preventing stagnation under the center section and maintaining high velocity through to the rear diffuser.

The result is dramatic front and mid-section downforce increases without adding drag-inducing topside elements. These are gains that do not show up in photographs but show up immediately on a data logger.

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

All ARD parts are made in prepreg carbon fibre. Prepreg carbon comes with the resin already impregnated into the fibre in controlled conditions, so the resin is spread evenly through the whole part. That makes the part lighter and stiffer, without weak or resin-heavy patches that could delaminate under load.

For undervanes, the material argument is straightforward. These components operate in a high-debris, high-heat environment on the underside of the car, exposed to road surface turbulence, brake heat, and sustained aerodynamic loading across an entire session. Prepreg carbon handles that environment without fatiguing. It also holds the vane geometry precisely, which matters because a vane that deflects under load generates a different vortex than the one it was designed to produce.

Vehicle Fitment

• 2020-2026 Toyota GR Supra
• 2026 Toyota GR Supra Final Edition

Send a few photos of your car to addison@sl-autowerkes.com and we'll confirm fitment before you order.

Before you paint or fit it

Check the packaging label against your order when the part arrives, and do a full test fit before any paint or installation. Returns and warranty claims aren't accepted on parts that have been altered or are no longer new and resalable.

See our GR Supra upgrade guide for where we would start on an A90.

More parts for the Toyota GR Supra A90: BMW B58 | Toyota Supra Catted Downpipe 200 Cell and Toyota GR Supra ARD Prepreg Race Front Lip (Stock Bumper) 2020+. See all Toyota GR Supra A90 parts.