Great review, and thanks for doing this, looks like I'll be grabbing an EK or Koolance top. Currently, I have my stock D5 Lang wrapped in closed cell foam (I had some leftover from car audio install) which has made it virtually silent (especially from outside the case) for the past 6-7 years. It's not much for aesthetics wrapped in foam, unless you like that laboratory experiment type look, but if you hide your pump then who cares as it greatly reduces all pump noise.
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