[JayG]

Originally Posted by KRAM36

The bumper replacement is on hold. http://986forum.com/forums/general-discussions/55530-goy-my-new-front-rear-bumpers-wheels-way.html#post433870

I believe the slots in the upper portion of that front bumper would allow the air to escape and give front down force too. So that would probably reduce mpg too, not sure at what speed that would come into play though.

You need some kind of an airfoil to get down-force. Again, it's aerodynamics/physics. I don't think air flowing through those vents will give you down-force.