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Old 11-03-2012, 02:09 PM   #4
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Join Date: May 2009
Location: Washington (the state)
Posts: 1,689
My Ride: 2003 325xi
Originally Posted by Shadow330xi View Post
Does the stewart pump increase the flow of coolent over the OEM pumps? I know it has a metal impeller instead of a composit one, so that is nice.

Yes, but very slight flow increase. The impeller, massive bearing and quality is the bonus. Just look at the pictures, they're killer pumps that won't grenade.

You may get a new pump drive pulley in aluminum (cheap) as the composite one you're taking off may be tired and crack. Don't get underdrive pulleys! Stewart says NO.
Anything made can be made Better
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