The Same Mainplane, Working Harder

You already own the hardest part to get right: the AT-M3 mainplane. The HD upgrade takes that wing and makes it work harder: a gurney flap for the trailing edge and a set of updated endplates to replace your originals.

The result: at a fixed wing angle, roughly 192N (43.2 lbs) more downforce for about 35N (7.9 lbs) of drag at 180 km/h (112 mph). That's a serious step in rear grip from two components — no new mainplane, no new mounts, no starting over.

How a Tab This Small Moves Numbers This Big

The gurney flap is a small tab standing up at the trailing edge, and it punches far above its size. Air stacks up in front of it and rolls off the back into a pair of vortices that sit just behind the wing, acting like an invisible extension of its shape. The wing behaves as though it were more curved than it actually is. That's how a tab this small generates a gain this large: it changes what the air thinks the wing looks like in a very efficient way.

The endplates attack a different loss. Air always tries to spill around the ends of a wing, leaking from the high-pressure side to the low. Every bit that escapes is downforce you paid for and didn't get. The updated plates are larger than the originals and angled inward at the lower edge rather than sitting flat, sealing more of the wing's span so the pressure difference stays where it works. They also carry the outer ends of the gurney, which is why the two ship together — this is one system, not two accessories.

Spend the Gain Your Way

Where the extra load goes is up to you. The AT-M3's eight degrees of adjustment mean you can take the full gain as downforce, or trade some back for less drag and more straight-line speed, tuning the wing to your track, your setup, your driving.

Fitment & Construction

Both parts are prepreg carbon fiber, the same motorsport-grade process as every ADRO component, for an exact resin-to-fiber ratio that wet lay can't match. The gurney sits along the mainplane on 3M tape and attaches at each endplate. New mounting hardware is included.

Already running the AT-M3? This is the most cost-effective downforce you'll add to the car. See you at the track!