There is another SuperTech filter that is 3/4 " longer han the 6607. It is number 7317. I cannot decide what kind of voodoo these manufacturers use. My old Maxima (190 h.p.) used the 7317 filter. It is small but the 6607 is tiny. My newer Maxima (255 h.p.) uses the small 6607. These filters are made for Walmart by Champion. They are both "98%" effective, have synthetic paper and both fit my Bird fine. I believe they are safe. All filters go into bypass during extremes. In that mode they won't strain out gravel. There are many here that must have a Honda filter to sleep comfortably. Those are the type of people you want to look for when you buy used.