BLOCK SUBSTANTIAL TURBULENCE while driving with the top-down. Prevent hair from swirling about at freeway speeds. QUITE COCKPIT: Talk on your electonic devices and converse with the passenger next to you without strain. LIFETIME WARRANTY AND 30 DAY TRIAL. We stand by our product. ABRASION RESISTANT MATERIAL, will stay clear for the lifetime of your car. NO SQUEAKS OR RATTLING. Unlike other wind deflectors, this windscreen stays securely in place when mount, eliminated novice-induced vibrations. This is the #1 Ranked Z4 wind deflector for 2002-2008 models. For all of the reasons you purchased a convertible, this wind deflector will make all of those reasons come alive.