MuuMuu101's 68 Dart, A Learning Process...

I agree. To be aerodynamically significant with that size of spoiler you'd have to be talking about speeds above 70 to 80 mph at least. Below that it's pretty much just looks. Above that though and it might make a bit of a difference, at least enough of one that it would need some more support.

Did it hit the ground when you were braking into a corner?

I was driving at about 80+ mph when I was driving there. Traffic was a little more so I was around 60-70 mph on my way back. I still didn't notice anything, but I think I can make a better one out of Carbon/Kevlar using the ABS one as a mold. I just need a vacuum pump, the composite plies, and resin. I have all of the vacuum bagging at home.

And I used the spoiler as a cone plow...