Sorry for the shitty pics but they'll do. In order from left to right we have: K&N, Mobil 1 Extended life filter, Purelator PureOne, and Fram tough gaurd.
Apon cutting open the cases of the K&N and Mobile units you'll notice that the filtering materials look the same; This is because they are the same material in a differant case(and one costs more).
K&N:
Mobil:
The mid-grade filter here is the Purelator PureOne filter. It shares similar construction to the Mobils and K&Ns with the tighter filter packing, metal end pieces and check valves.
Purelator:
Now it comes down to the Fram filter. Crap for packing, the end pieces look to be kindergarden construction paper hot glued to the filter media, there's no check valve and they typicaly have less oil capacity than most filters. Feast your eyes apon the most sold filter in the Advance chain of stores:
Fram Tough Guard(aka their preium filter under the racing filter)
I'm sure some of you have seen setups like this. For those who haven't I hope it serves as an educational aid that fram = garbage.
I just use OEM Honda filters for daily driving, does the job. I've used HAMP before for track or spirited driving, not sure can feel the difference but it suppose to be better for oil pressure etc.
OEM Honda Filter is Very good, and the Hamps is made to the same quality only it is made in Thailand hance the price difference, but mugen Filter has the same dimension and size it uses better Filter paper to trap more unwanted particals so if you are after performance and you do your SVC every 5000 Km's and frequen Track Day then Mugen is what I'll recommend, other wise OEM honda oil filter / Hamp Oil Filter is best for honda engine, I wouldnt trust anything eles.