I think either of these pumps would be way more than you'd want to run through a single SCWD. I have a SCWD running off a Mag7 and it switches every 9 seconds. The T4 surpasses the SCWDs rated pressure and with the MAK 4 it'll switch every second or two. Way too quickly to get good wave action. If you were to go with either of these pumps I'd split your return through two SCWDs. Just my thoughts.
Evan.
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