Loada scrap metal! It's not gonna make a difference, just like magnets on fuel lines etc. If you really wanna try it, don't spend cash, chop up a coke can.
Heheheheheh, Hahahahahahahahahahh, ooh, that's a good 'un ...
A very old 'un, but still a good 'un.
Here's a thought .. for the fiver/tenner/twenty that it's selling for, why not just feckin' buy it, try it and report back as to how good it really is?