Originally Posted by xluben
I think those covers can only really vent air from inside the bumper. I'm not sure if they do much. The one of the driver's side may actually be sucking in air if you have a cold air intake.
Once you get used to it, they're really easy to get in and out. I take my driver's side one off and on all the time. Only takes a second or two to pop on or off.
well they are on tighter from the factory I think...once you get them off once its easy, but I rushed putting one back on and lost it..lol. I think I got my black ones to seat properly