I am curious if it is just ethanol killing our injectors. I have been replacing injectors in these cars since 1995 and not sure if any ethanol was used back then. Also the X-terra 2000-2004 use a side feed similar to ours, but have no problems to date. Could just be the hot and naturally corrosive environments of our engine compartments as well as the constant 12v on the earlier systems. We may never know completely, but if i'm upgrading myself one day it will probably be for some top feeds as I still see many people with newer style injectors complaining of failure.