I have my 18 XPT stock blow off vented, but the part throttle leak is annoying. At slow speeds the factory bov hisses until about 1/2 throttle. It’s loud and annoying when cruising. I hear the Evo only pops off when throttle is lifted? Can anyone confirm or recommend a valve that stays closed at part throttle? In my experience they should stay closed until throttle is lifted, but this stock one dumps a lot until 1/3 throttle!

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