Has anyone tried these units on ebay? They are price really well is it worth the money? Will it increase anything?

please advise

http://cgi.ebay.ca/Vortex-Generator-for-Equinox-Express-HHR-HP-MPG_W0QQitemZ8066965366QQcategoryZ42604QQrdZ1QQcmd ZViewItem

http://www.chevyhhr.net/forums/showthread.php?t=1637
http://chevyhhr.net/forums/showthread.php?t=1605

Those commonly cause only a draining, sucking noise from your wallet.

laff but one of these babies + 80mph will make u a crazy tasty smoothie