This is not true of OEM valves. A naive investigator may see this and go "yeah, thats how it works" but someone with their eyes open will notice that there is a pressure feed to the back side of the diaphragm too such that under boost it is ONLY the spring holding it closed.All BOVs have a reference line coming into the top of the BOV from your post-throttle body intake manifold. Under high boost, the force holding the BOV closed is BOOST! The pressure coming through the reference line is equal to the pressure under the BOV piston. Therefore a VERY mild spring will hold it shut just fine under these conditions.
Yea itz mostly people that dont know too much about turbos n shit. it jus mad shiny n stands i guess thatz whyyou have an external wastegate??
Most people I know usually say wow, hear how loud his wastegate is? or I love the sound of the wastegate going PSHHHHH.......