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yup, if it uses maf sensors, it will basically expect air to get back into the intake from a dv. However, a BOV is atmospheric so thus no air goes back into the intake causing a loss of power because the engine expected more air than what is really there. With a MAP, you can run a BOV safely and what not. The hybrid ones you mention is both recirc and atomospheric. Until high loads (more PSI) it shoots into atmos and under low load, it shoots into the intake. Btw, what you said about the STi BOV sounding like shit is all subjective. It's the brand of the BOV that makes the unique sound not the car.
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