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I have the flex-a-lite black magic #180 fan. You can get it from summitracing.com for $260 I think. Great fan and improved throttle response and gas mileage. Its not cheap but well worth every penny. It is also easy to install.
I was just talking to the guys at fex-a-lite today at PRI about a project and what fan I sould use for it. they said the black Magic and maybe a pusher fan in front.