Both river Rat and I cut open and compared an STP 3950 and a Purolator L 10193. Neither one of us saw much difference and his flow and filter testing gave very similar results. With all the hype here on Purolator, you can get a very similar filter made in American by an American company for the same price, or in your case, maybe less. If I could get an STP cheap, I wouldn't hesitate a second to use it.
I am running a Pronto on my truck now, but it may be the last of the American made ones. I picked up a NAPA Gold On sale, but may go back to STP.