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Old 11-04-2012, 12:57 PM   #8
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Join Date: May 2009
Location: Washington (the state)
Posts: 1,689
My Ride: 2003 325xi
Kubica, not sure if you're suggesting underdrive by "power pulley set"?

Basically, Stewart states in their info. to not underdrive their water pump as flow result will be wrong. Just match the factory mm spec. for all aluminum replacement pulleys.

Edit: I never argue with Kubi, ('cause he knows a great deal more than I) however, I'm certain on this one. Keep the factory belt and pulley sizing. You may confirm this on the Stewart website.
Anything made can be made Better

Last edited by White_Knuckles; 11-04-2012 at 01:04 PM.
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