Yea...the Pure One 10 is the longer one...Will never dive into the oil preasure thing, however Pure One is at the top of the list.Purolator Pure One PL14610(which is the longer one) and PL14612 which is the normal size our bikes use. Alot of guys on here say to use the longer one because its longer. Most seem to think bigger = better, to each his own, but I think the more volume in your oil filter can reduce your oil pressure, which may have some adverse affects on your motor at higher RPM.
Either way the Pure One filter is a great filter. There was a link to an Oil filter review floating around here not to long ago and the Pure One scored really well.:beer: