Yakima Windjammer - WHETHER YOU FIND THE WHISTLING WIND SCRAY, CREEPY, OR JUST PLAIN ANNOYING, YOU CAN GAG IT WITH ONE OF THESE. - Snaps on front crossbar in seconds - Creates smooth flow of air to reduce wind noise - Product # 01115 Q: How many do I need A: One placed in the middle of the front bar is usually all that is needed. Using more than one may reduce noise marginally, but using a fairing is the best way to go. Q: How is it installed Do I have to disassembly the rack A: It spreads open on the trailing edge and snaps closed ala zip-lock style. Q: How does it work A: First of all, the primary cause of roof rack wind noise is harmonic vibration (impress your friends with that line!) When angled up or down a few degrees, the WindJammer redirects enough wind to dampen that vibration considerably.