This may be a little late but I have been using the filtermag on my bikes for several years now. You don't notice them and it is designed to increase the efficiency of you filter against ferrous metals. They are so strong they are actually hard to pull off the filter. I actually cut away one filter after 5,ooo miles to look at the underneath side of the filter. Where the magnetic is sitting there was what looked like a film of dirty oil (like the oil drain plug) and the remainder was clean. I put it on my 08 the day I picked it up and my drain plug magnetic was clean at the 1,000 mile service. I like the idea of all the oil passing by this strong magnetic within the oil filter. I have transfered from every bike I have owned.
Where I work we rebuild the M1 Abrams tank and they have a similar device on some of the crucial engine oil lines and hydraulics.
I can take a photo and post if anyone wants to see what it looks like, just let me know.
Bob