Cavitation: That why pumps should be designed by engineers, not mechanics. :)
No issue if the would not put a price limit on the WP cost. Only ones seeming to spend the money are the $100K motors that need to carry a warranty. Until then attention K mart shoppers
If memory serves me correct, I purchased the upgraded German made unit from Ricambi with the major kit. So far, so good. Put a new water pump in, it's worth the "peace of mind".