The latest generation of the Turbo claims to have reduced back pressure. I don’t believe it’s flow-through though.
ETA: I just checked the site and the exact wording they’re using in advertising is “reduced blowback” due to redesigned baffle geometry. I’m also curious to see if they do come out with a flow-through suppressor but I don’t see it happening anytime soon because the Turbo T3, Turbo K-RB and Fat Cat were only revealed at SHOT this year.