[Drakiv]

Voltex Type 7 GT Wing (Swan Neck), downforce is produced on the underside of the wing






Also some notes from a search:
Both wings and spoilers reduce up-lift at the tail of the vehicle, but use different mechanisms. Wings are airfoils designed to directly deflect air upwards and thus push the rear of the vehicle down. They generally add quite a bit of drag. Spoilers are barricades to undesirable flows, and thus are able to reshape airflow streams around the vehicle. This can help keep the rear of the vehicle down and decrease drag by changing the effective vehicle shape. You need computational fluid dynamics and/or wind tunnel testing to quantify spoiler/wing performance. Neither have any positive impact whatsoever on straight-line low-speed acceleration. Both are primarily intended to improve stability and cornering at high speeds.