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Message: <blockquote data-quote="CobraRGuy" data-source="post: 1549030" data-attributes="member: 24211">I agree. The factory fan flows plenty of air to cool my 600+HP engine. I had a custom 3" Griffin radiator that started leaking after only a few years. It was not repairable so I ended up buying a custom Ron Davis 3" core radiator (~$2,500, OUCH!). I had them make it with an extra 1/4" female pipe thread fitting in the passenger side tank so I could add a sacrificial anode (for a custom radiator I would recommend doing the same). Be aware that thick cores with more fins/inch resist air flow to a much greater extent, so it's important to seal up the gaps between the radiator and the shroud.The factory fan shroud on the '95 Cobra Rs had holes cut in them to allow for more air flow through the radiator at high speeds. When I added the Griffin radiator I found that the fan was drawing air in through the holes and back out through the fan. I fabricated some rubber flaps to cover and seal the holes while the car was stationary but allow air to flow through those holes at high speed. They work great, but I doubt that any stock Mustang would have those holes.</blockquote>