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The ring is not an porsche item. Is made by Klaus so no OEM numbers. The outer diameter (250mm) is smaller than the turbo unit. I think the 11 blade fans are ok to be turned down to a smaller dia. and the twisted- end 12 blade are not because of drastic loss of air flow. I think GWD uses a turned down 12 blade fan(240mm). If you are planing to turn down a original porsche fan, you must buy a smaller ring from a tuner and have the fan rebalanced afterwards. I think it works this way.
Last edited by eugene; January 21st 2008 at 08:07.
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