I have an iwaki md-20 an md-15 and i did have the same problems you are having. It made a lot of noise. But it is not cavitation or something like that.
These powerful iwaki pumps need a lot more resistance in a loop, when you load your lines with more waterblocks(adding resistance) and when you are using longer lines, the noise will dissapear. I have had the same problems, all is solved now.
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Intel PIV 3200@3840
DFI Lanparty pro875B
1024mb(2x512) ocz pc3700EB(2.5-2-2-5)
Lian Li pc6070B
Ati Radeon X800XT PE
creative audigy 2
Silicon Graphics F180 (18,1 inch TFT) and nec-mitsubischi 930sb(black)
jpiperformance V5 external watercooling(black) containing:
-iwaki md20R
-2x xlr120 rads
-swiftech mcw6002
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