I have been running my h22 99 civic for about a year and haven't had any problems. I am using a oem single core radiator (paper thin) and a flexalite fan. I don't have problems with over heating but I plan on installing a turbo kit at the end of the month and doubt the single core can still do its job. As the car sits the fan blade is mm's away from the clutch bleeder. So will a 2 1/2 inch radiator with a pusher fan work? and can you change a puller fan into a pusher? Thanks for any info.