ADRO R14A90-1301 Rear Race Diffuser ARD for BMW M2 (G87)

Description ADRO R14A90-1301 Rear Race Diffuser ARD for BMW M2 (G87)

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 using CFD simulation and track testing before reaching a customer.

Scott, ADRO's Head of Aerodynamics, brings an F1 development background to every ARD project. The G87 M2 ARD Aero Package is one of the first full systems to come out of that program.

The Rear Diffuser

A diffuser takes the high-velocity, low-pressure air traveling under the car and gradually expands it back to ambient pressure before it exits at the rear. When correctly designed, this expansion accelerates the Flow ahead of it, increasing suction across the entire underbody. Gaps and interruptions in the undertray can allow turbulent air to mix in, causing pressure recovery to break down and reducing diffuser performance.

The ARD rear diffuser is developed as the endpoint of a complete underbody system, not as a standalone component bolted to the rear bumper. The diffuser undertray seals gaps that cause turbulent recirculation under the car, helping maintain high underbody velocity across the full floor.

The diffuser strakes generate vortices that energize the boundary layer and help prevent Flow separation as the channel expands. ARD undervanes generate large-scale vortices that feed conditioned, high-velocity Airflow rearward through the floor and into the diffuser inlet.

• Developed as part of a complete underbody system
• Diffuser undertray seals gaps that cause turbulent recirculation
• Diffuser strakes generate vortices to energize the boundary layer
• ARD undervanes feed conditioned, high-velocity Airflow rearward through the floor

Specifications:

• Complete ARD Aero Package downforce at 180 km/h: 2555 N (574 lbs)
• Increase over the M2's stock downforce: 1254%
• M2 stock downforce: 189 N
• Downforce gain: +2366 N (532 lbs)

Material

ARD components are produced in prepreg Carbon Fiber. Prepreg uses resin pre-impregnated into the fiber under controlled conditions, providing precise and consistent resin distribution 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, altering the pressure gradient the strakes work against. Prepreg holds the designed geometry at speed and under heat, helping the diffuser perform consistently across a full session rather than degrading as conditions change.

Note:

Due to ongoing fluctuations in shipping rates, prices for ADRO products are subject to change. Please contact us to confirm the final price, including delivery, before placing your order.

Shipping individual components is currently particularly costly. We recommend ordering complete kits to help reduce shipping costs and get better value from your purchase.