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Simple answer
Composite impeller. If the bearing fails and the impeller gets wobbly, it can machine the block causing many problems. There are lots of posts on this topic
I got the Pierburg WP which is the same as the Porsche OE WP and even has the Porsche part number stamped in it. Same item, lower cost. No Porsche tax
I did a lot of searching and Warehouse 33 was not only the best $$, the service is the best I have found
FYI, Other than being a customer, I have no association with them
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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