Been collecting all this stuff onto my hard drive. I even made my own pinout for the pre-face-lift BE/BH's.
So here's the ever illusive BH pinouts. Caution, it's still a work in progress
BH5A Turbo Pinout - WORK IN PROGRESS
And some handy stuff:
MY99 Legacy Wiring Diagram. Turbo models included!
http://reuben.xpjets.com/random/BH-Conversion/BH-WiringDiagram-JDM.pdf
V5/6 Wiring diagram and pinout
http://reuben.xpjets.com/random/BH-Conversion/Possumlink-MY99Manual.pdf
Legacy pins vs Impreza pins. The top is legacy, bottom is Impreza. Note the pin numbers, B134, and B136 are reversed on the 2.
Factory legacy pinouts, awaiting proper scans