Bought a Turbosmart and fitment was great. Seemed like a nice piece, but I just wanted the Synapse back, so I ended up cutting a ton of the metal piece that the splitter mounts to, in order to make it all work. Now it fits in there pretty well.
So from my experience, if you're OK with cutting away that metal (I don't think it serves a functional purpose with the new PW splitter) you can use the Synapse. If you don't want to, Turbosmart works great, and I bet the Forge will as well
Basically I had to route the BPV hose as far away from the TMIC as possible, and clock the BPV as far forward as possible. Then cut a hole in the approx area that I did with the metal piece, right up to where both metal sheets are tacked together next to the splitter