I've been living with this since the car was new (2015) thinking it might be normal but thought I'd ask. Under very steady light load, between 6 in-Hg and 6 PSI, I get this very constant hissing which sounds like probably the BOV. This is my first tubo car, used to SCs. That will persist until I let off the gas or accelerate taking the vacuum/boost out of that range. Is that normal or is it possible my BOV is just weak or something?