Quote:
Originally Posted by gmd2003
Not too surprising the water pulley with most supercharger kits runs the pump harder. The ones in our cars is quite good and better than most aftermarket options, the only thing that goes is the bearings usually at 80-100k miles. I am replacing mine while switching my radiator to an OEM one from Tischer. Some places have stock pumps with modified bearings and impellers for the E46 M3 water pump but none for the Z4M as our housing and connections are slightly different. Stock is the best option in this case, especially since its quality.
George
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Didn't know our pump is different from the E46 M3 pump, thanks for the heads up. I doubt there's a good aftermarket replacement for such a rare part