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I am purchasing a new water pump for my 1999 3.4l 996 Porsche. Can some one please tell me what the best product is and should i purchase a pump w/ a Plastic (Composit) or Metal Impeler? I wact to purchase a replacement part that i know is the best and i dont mind spending a few extra bucks. Thank you in advance. P.S. Also where can i purchase the item?

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Welcome!

 

I recommend the OE pump from Sunset Porsche. It has composite impellers. The concern on metal impellers is if the pump goes, the impeller will mill the engine block.

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+1 on that. Just did it couple weeks ago.  While you are there you will want to do the thermostat if it has not been done. Get the LN Engineering 160 degree thermostat. Search on it but let me save you some time condensing 100 posts- doubters -->"Bla Bla Bla that can't matter", True Experts (which I am not) -- > "get the LN 160", I live in Boston it makes a big diff, in FLA it will too, does not solve every problem like max temp in every peak situation, but much cooler for sure.  Actually to be fair to the doubters I had some doubts as to whether it would work and I can see the logic of their thoughts, but there are some True experts that recommend it and sure enough - they were right. Mine was running too hot and its fine now. 

Edited by PorscheServiceThen529Plan

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Agree with the above...get composite impellers and do the low temp thermostat. The oil/coolant exchanger heats the oil which leads to premature oil breakdown.

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