I would contact them and ask. Not sure the exact function but seems to better channel water down the “silencers” to reduce some noise. But again mine still has some noise.No I don’t.
You can see there is no room for 90s and when I looked at the drain bulkhead was a bit worried about modifying the drains (to the point of no return). At the show the drain was very quiet but I didn’t see how much flow they had. If you look at my build thread you can see some pictures of their display at Reefapolooza Chicago.