Dual 1.5" drains with a Mag 7. Hmmm There are so many factors that come into play with the noise issue. The way my drains are, I don't think that a Mag 7 would make any noise but I've never tried it. My Iwaki 70 doesn't make that much drain noise. But I also am using the elbows inside and standpipes outside. If you're worried about space inside the tank, use a shallow internal and larger external box. I've seen it run that way with no elbows or bulkheads in the tank. Can't say if it was quiet or not though.
Did I dodge that question well enough? hahaha, j/k.
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