Verdict: I trimmed about 1/4" - 3/8" off the end that connects to the turbo, and everything seemed to fit better, especially the BPV attachment point.
For those searching in the future, this was on a 2005 Legacy GT MT, with a Perrin PSP-INT-421BK inlet tube (2.4" turbo connector) and a BNR 16G Evo 3 turbo.