i like to say that video is B.S. because they didnt run both bov the same. if you pay attention to the video when they viewed brand x( a actual tial 50mm spring ) they was running low boost at low rpm so of course it will surge. i bet if you ran it full boost at high rpm ( like they did with the synchronic bov ) it wouldnt surge that bad. cause i know for a fact the tial doesnt sound like that under full boost.

like i said the video was made to make the synchronic bov look better when actually it isnt

i have the turbo xs rfl and its a decent bov imho