Hi all
Anybody tried one of these expensive but are they worth it


http://cgi.ebay.com/ebaymotors/Yoshimura-Performance-Jet-Kit-Yamaha-YZFR1-R1_W0QQcmdZViewItemQQcategoryZ35597QQihZ002QQitemZ120034703891QQrdZ1QQsspage nameZWD1V