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the stock s13 ac fan is plenty for my sr w/ koyo. I was actually really surprised how much air it moved... and the Koyo has mounting points for this fan for an oem-like fit. wired up a variable t-stat switch to a new relay that sees voltage from the brown O2 heater wire (ignition on)... works perty good. heatshrink tubing & aircraft grade splices are yr friend
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