Some 2001-2003 model year Mustangs may exhibit a whistle type windnoise from the "A" pillar area. This may be caused by wind moving over the fastener holes of the "A" pillar applique.
Verify condition by taping off the area. Install a foam block in the applique to keep wind from passing over the hole and causing the whistle. Refer to the following Service Procedure for details.
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage