well for the stock piping, the BOV is located out in the open, meaning that is a copper worth his salt pops your hood, it would pretty much stick out. you could move it lower down the intercooler pipes i suppose if you had an aftermarket intercooler but why would you want to hide a blow off valve for?
assuming u get a yellow for your BOV, just swap it over with the stock one and go over pits...end of story
but if u get a yellow and you have a BOV welded on to your piping then it would make it trickier to remove just for an inspection rite
bambam