So, a year ago I was driving down the highway when I heard a loud fast flapping sound. Turns out my front air shield was cracked. I tore it off and went on my way. This week I ordered a new one. I put it on the car (despite the screw holes not lining up perfectly) and started to drive and had the same loud flapping sound. Took it off and it went away. Am I missing something? Is there some special part that goes around the lower spoiler/bumper for mounting it that I might have lost with the original? I'd like it installed, but can't drive around with it sounding like something is constantly bumping the car.