I think it just makes the back end sort of droop down without it, the ground effects make the car look lower to the ground than it is, and the rear fascia kinda draws your attention downward, making the back of the car sag...the spoiler brings it back up so it doesnt look pinched off in my opinion.
the only problem with mine is that it doesnt like my sub, and it drips water for about 20 minutes after a wash.
2001 Mustang Bullitt
Dark Highland Green #0048
Performance by Ford Racing, Bassani, SLP, H&R and etc.
Former owner of a 99 Silver Frost SVT
GetOnItRACING