Why do the undervanes generate more meaningful downforce than visible aero elements on the G87 M2?

The floor of a car generates aerodynamic load through ground effect; the acceleration and pressure reduction of air passing between the floor and the road surface. This mechanism produces downforce with a much lower drag penalty than wing-generated downforce because it does not add a large topside pressure profile to the car. The ARD undervanes enhance this mechanism by generating large-scale vortices that increase suction on the lower surface and keep high-velocity flow moving through to the rear diffuser. The gains appear on a data logger rather than in photographs.

What do the vortices generated by the undervanes actually do?

Each vane generates a vortex off its edge as airflow passes over it. These vortices create a region of low pressure between themselves and the floor surface, which increases the suction pulling the car toward the road. Simultaneously, the outboard direction of the managed airflow prevents stagnation under the center section. The undervanes keep the entire underbody working at high velocity, which benefits both the floor's own downforce contribution and the rear diffuser's extraction efficiency.

What does the 2,555N downforce figure refer to?

That figure refers to the complete ARD Aero Package for the G87 M2 at 180 km/h; not the undervanes alone. The undervanes contribute primarily to the front and mid-section portion of the system total. The complete system represents a 1,254% increase over the stock M2's 189N, with a gain of 2,366N (532 lbs).

Why does prepreg matter specifically for undervanes?

Undervanes operate on the underside of the car in a high-debris, high-heat environment exposed to brake heat, road surface turbulence, and sustained aerodynamic loading across an entire session. Prepreg carbon fiber handles that environment without fatiguing or delaminating. It also holds vane geometry precisely under load; a vane that deflects changes its angle relative to the airflow, which changes the vortex it produces and degrades the flow management it was designed to deliver. Prepreg maintains geometry consistently from the start of a session to the end.

Do the ARD undervanes require the rest of the ARD system to work?

The undervanes generate meaningful vortices and underbody suction as standalone components. However, they are specifically engineered to receive the organized, clean airflow delivered through the ARD front splitter's raised central section and mid-floor channels. With the splitter feeding clean flow to the undervanes and the undervanes feeding clean, high-velocity flow to the rear diffuser, the system produces significantly more than the sum of its parts. For the full aerodynamic benefit, deploying the undervanes as part of the complete ARD package is the intended approach.

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Description

ADRO ARD Carbon Undervanes for G87 BMW M2

Most aftermarket aero kits stop at the surfaces that are visible from ten feet away; wings, splitters, canards, diffusers. The underside of the car receives nothing. It is also where the most significant aerodynamic gains live. On a production car at track speeds, the floor is generating more aerodynamic load per square meter than any visible element, and it is doing so entirely through ground effect and underbody pressure management. Adding a wing generates rear downforce at the cost of drag. Developing the floor generates downforce front and mid with minimal drag penalty. ADRO’s motorsport engineering program, ARD (ADRO Racing Division), addressed that floor directly.

What is ARD?

ADRO’s motorsport engineering program, ARD (ADRO Racing Division), is built for drivers who demand more from their car on track. Every ARD component is developed the same way motorsport aerodynamics are: 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 G87 M2 ARD Aero Package is one of the first full systems to come out of that program.

Features

Strategically positioned beneath the G87 M2 chassis to transform underbody airflow management
Generate large-scale vortices that dramatically increase suction on the lower surface of the car; measurable downforce gains in the front and mid-sections
Direct airflow outboard to prevent stagnation under the center section and maintain high-velocity flow through to the rear diffuser
Deliver front and mid-section downforce increases without adding drag-inducing topside elements; gains that show on a data logger, not in photographs
Engineered to receive the clean airflow delivered by the ARD front splitter’s raised central section and to sustain underbody flow into the ARD rear diffuser
CFD-developed by ADRO’s motorsport engineering program under the direction of Scott, ARD’s Head of Aerodynamics, who brings an F1 development background to every ARD project
Track-tested before delivery; every ARD component is CFD-simulated and validated on track before reaching a customer
Produced in prepreg carbon fiber; handles the high-debris, high-heat underside environment without fatiguing; holds vane geometry under sustained aerodynamic load
Includes 4 underbody vanes

Applications

BMW M2: G87 | 2023-present

G87 M2 ARD Aero Package

Frequently Asked Questions

Why do the undervanes generate more meaningful downforce than visible aero elements on the G87 M2? The floor of a car generates aerodynamic load through ground effect; the acceleration and pressure reduction of air passing between the floor and the road surface. This mechanism produces downforce with a much lower drag penalty than wing-generated downforce because it does not add a large topside pressure profile to the car. The ARD undervanes enhance this mechanism by generating large-scale vortices that increase suction on the lower surface and keep high-velocity flow moving through to the rear diffuser. The gains appear on a data logger rather than in photographs; which is exactly the point.
What do the vortices generated by the undervanes actually do? Each vane generates a vortex off its edge as airflow passes over it. These vortices create a region of low pressure between themselves and the floor surface, which increases the suction pulling the car toward the road. Simultaneously, the outboard direction of the managed airflow prevents stagnation; a stagnant area under the car’s center section slows floor velocity and reduces the pressure differential generating downforce. The undervanes keep the entire underbody working continuously at high velocity, which benefits both the floor’s own downforce contribution and the rear diffuser’s extraction efficiency.
What does the 2,555N downforce figure refer to? That figure refers to the complete ARD Aero Package for the G87 M2 at 180 km/h; not the undervanes alone. The undervanes contribute primarily to the front and mid-section portion of the system total. The complete system represents a 1,254% increase over the stock M2’s 189N, with a gain of 2,366N (532lbs).
Why does prepreg matter specifically for undervanes? Undervanes operate on the underside of the car in a high-debris, high-heat environment exposed to brake heat, road surface turbulence, and sustained aerodynamic loading across an entire session. Prepreg carbon fiber handles that environment without fatiguing or delaminating. It also holds vane geometry precisely under load; a vane that deflects changes its angle relative to the airflow, which changes the vortex it produces and degrades the flow management it was designed to deliver. Prepreg maintains geometry consistently from the start of a session to the end.
Do the ARD undervanes require the rest of the ARD system to work? The undervanes generate meaningful vortices and underbody suction as standalone components. However, they are specifically engineered to receive the organized, clean airflow delivered through the ARD front splitter’s raised central section and mid-floor channels. With the splitter feeding clean flow to the undervanes and the undervanes feeding clean, high-velocity flow to the rear diffuser, the system produces significantly more than the sum of its parts. For the full aerodynamic benefit, deploying the undervanes as part of the complete ARD package is the intended approach.

About ADRO

Founded in 2020, Aerodynamic Development Race Optimization (ADRO) is dedicated to delivering premium aerodynamic body kits. The company was born from the shared passion for racing of its co-founders, CEO Dongwan Yoo and CTO Sean Yoon, who connected through a mutual friend in 2010 and bonded over their love for race cars. Over several years, they perfected their craft by creating custom body kits for KDMs as a hobby. As demand for their work grew, they established ADRO to expand their offerings. ADRO’s high-quality products are designed in California and meticulously manufactured in South Korea

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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ADRO ARD Carbon Undervanes for G87 BMW M2 [R14A90-2601]

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ADRO ARD Carbon Undervanes for G87 BMW M2

What is ARD?

Features

Applications

G87 M2 ARD Aero Package

Frequently Asked Questions

About ADRO

Reviews