I "think" the different colors on those combo's denote different "bypass" ratings. The colored ones are not all that common, most of them are black. All the ones I have used and cut (and admit I had no trouble with) were black. They seemed stiff to me as well, but as far as I could tell worked just fine in actual service.
All the black one's I used were for the Jeep which generally specs a bypass in the 12-14 psi range. Do you happen to know what your filter bypass spec is supposed to be?
All the black one's I used were for the Jeep which generally specs a bypass in the 12-14 psi range. Do you happen to know what your filter bypass spec is supposed to be?