Q: What turns the High-Efficiency spoiler into the High Downforce version?

A gurney flap. Adding the flap to the efficient base spoiler transforms it into a trunk spoiler optimized for racing use. The flap’s shape combined with the base spoiler’s efficient profile creates a dramatic jump in rear downforce. The High Downforce package includes both the efficiency wing and the attachable gurney flap, so you get the full racing setup in one box. For even more rear downforce, the Dual Rear Carbon Fiber Spoiler Set steps up to a two-plane wing.