dollars for a "racing radiator"? just as a comparison the howe has a machined filler neck, and costs about the same or less. i also am not the only person thats had these problems, as ive seen/heard about the same things from ALOT of other z owners on, and off this board (check classifieds, there is acutally a koyo for sale right now with the same problems). i also have a good idea of how to install a radiator properly, but good point.