hey...everytime i go full throttle and let off to shift gears i hear this noise that kinda sonds like a blow off valve but its very short and it sounds like its coming from underneath my car...what do u guys think it could be?

 

Need a lil more info then tat. wat mods have u done to yur ride? then i get back to u.

 

i got no mods yet...all stock

 

What does it actually sound like? There are tons of BOV sounds out there.