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Do you either think that 1. your car comes with a factory turbo or 2. you can just put a blow off valve on a vehicle regardless of it having turbos or not?
listen. the turbos themselves are what you are going to hear as the "jet" sound. not the BOV. the only time you will hear the BOV is if boost pressure is built up then a load is taken off the engine (shifting or letting of the gas) the BOV's make more of a whistle or woosh sound based on what brand/type you have installed.
based on your story, you said the car took off so all you would hear would be the turbos and exhaust not the BOV. go read and learn about cars.
do yoo no ware i can gets turbovlave for my car? I wants to boost on the skyline from lightstop yes? It be much cool for the ladies. make jet soawnd like whoosh go fast!