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I'm running the DIF PWM fan controller, surprised nobody mentioned it. It replaced the previous DIF controller on the link a few posts up. The fans work at different speeds depending on the engine temp. So they're not on full blast all the time. I have a s14 with RB25, stock metal hood, two 12" Flex a lite fans pushing 2500cfm. NO problems overheating ever! while In traffic on hot summer days (90+ degrees) the water temps get cooler. When I shut the car off, the fans stay on full blast for the 30 seconds and turn off on their own. I'm very pleased with this product.
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