If you watch closely you will see that Ford F150 hoods after 2004 were manufactured out of a lighter composite material, therefore the hood now bounces where the hood meets the windshield. This happens without a bugshield installed; when a bugshield is installed it can aggravate an existing problem. Stampede recommends using a very low profile shield and taking your vehicle back to the dealership to have them fix the hood issue as described in the attachment. Attached is the Notice From Ford on the issue.