Quote Originally Posted by westwest888 View Post
It's like trying to prove that putting R-20 insulation in the walls of your house will keep it warm inside. I'm sitting in my warm house and IDGAF that you say my claim is dubious. If you drive 130 MPH and want the peace of mind of rear end stability, you should do what I did, exactly how I did it.

I really want to move on from this topic to more important things, but we can dwell on it for as long you'd like. There's nothing to refute here.
Except for the fact that you can empirically measure the benefits of R-20 insulation. If someone does it exactly like you did - Puts on the cosmetic spoiler lip and believes it will work for no other reason that they want to - yes you are right, it will give them peace of mind, even if a false sense of security.

You still are ignoring the fact that when you are going 130 it's in a straight line where rear end stability doesn't matter, and that you are taking turns where rear end stability matters at half that speed where the insignificant lip you have will do nothing due to lack of enough airflow to produce notable downforce on anything that size.